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cpp-httplib
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    <h1>What&#x27;s Next</h1>
    <p>Great job finishing the Tour! You now have a solid grasp of the cpp-httplib basics. But there's a lot more to explore. Here's a quick overview of features we didn't cover in the Tour, organized by category.</p>
<h2>Streaming API</h2>
<p>When you're working with LLM streaming responses or downloading large files, you don't want to load the entire response into memory. Use <code>stream::Get()</code> to process data chunk by chunk.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">http://localhost:11434</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> result = </span><span style="color:#8fa1b3;">httplib::stream::Get</span><span style="color:#c0c5ce;">(cli, &quot;</span><span style="color:#a3be8c;">/api/generate</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">if </span><span style="color:#c0c5ce;">(result) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">while </span><span style="color:#c0c5ce;">(result.</span><span style="color:#8fa1b3;">next</span><span style="color:#c0c5ce;">()) {
</span><span style="color:#c0c5ce;">        std::cout.</span><span style="color:#8fa1b3;">write</span><span style="color:#c0c5ce;">(result.</span><span style="color:#8fa1b3;">data</span><span style="color:#c0c5ce;">(), result.</span><span style="color:#8fa1b3;">size</span><span style="color:#c0c5ce;">());
</span><span style="color:#c0c5ce;">    }
</span><span style="color:#c0c5ce;">}
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;http://localhost:11434&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> result </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#323232;">httplib::stream::Get(cli, </span><span style="color:#183691;">&quot;/api/generate&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">if </span><span style="color:#323232;">(result) {
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">while </span><span style="color:#323232;">(result.next()) {
</span><span style="color:#323232;">        std::cout.write(result.data(), result.size());
</span><span style="color:#323232;">    }
</span><span style="color:#323232;">}
</span></pre>
</div></div>
<p>You can also pass a <code>content_receiver</code> callback to <code>Get()</code>. This approach works with Keep-Alive.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">http://localhost:8080</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/stream</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const char </span><span style="color:#c0c5ce;">*data, size_t len) {
</span><span style="color:#c0c5ce;">    std::cout.</span><span style="color:#8fa1b3;">write</span><span style="color:#c0c5ce;">(data, len);
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">return </span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">;
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;http://localhost:8080&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="color:#323232;">cli.Get(</span><span style="color:#183691;">&quot;/stream&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const char *</span><span style="color:#323232;">data, </span><span style="color:#0086b3;">size_t</span><span style="color:#323232;"> len) {
</span><span style="color:#323232;">    std::cout.write(data, len);
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">return </span><span style="color:#0086b3;">true</span><span style="color:#323232;">;
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<p>On the server side, you have <code>set_content_provider()</code> and <code>set_chunked_content_provider()</code>. Use the former when you know the size, and the latter when you don't.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#65737e;">// With known size (sets Content-Length)
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/file</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> size = </span><span style="color:#8fa1b3;">get_file_size</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">large.bin</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_content_provider</span><span style="color:#c0c5ce;">(size, &quot;</span><span style="color:#a3be8c;">application/octet-stream</span><span style="color:#c0c5ce;">&quot;,
</span><span style="color:#c0c5ce;">        [](size_t offset, size_t length, httplib::DataSink &amp;sink) {
</span><span style="color:#c0c5ce;">            </span><span style="color:#65737e;">// Send &#39;length&#39; bytes starting from &#39;offset&#39;
</span><span style="color:#c0c5ce;">            </span><span style="color:#b48ead;">return </span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">;
</span><span style="color:#c0c5ce;">        });
</span><span style="color:#c0c5ce;">});
</span><span style="color:#c0c5ce;">
</span><span style="color:#65737e;">// Unknown size (Chunked Transfer Encoding)
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/stream</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_chunked_content_provider</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#c0c5ce;">&quot;,
</span><span style="color:#c0c5ce;">        [](size_t offset, httplib::DataSink &amp;sink) {
</span><span style="color:#c0c5ce;">            sink.</span><span style="color:#8fa1b3;">write</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">chunk</span><span style="color:#96b5b4;">\n</span><span style="color:#c0c5ce;">&quot;, </span><span style="color:#d08770;">6</span><span style="color:#c0c5ce;">);
</span><span style="color:#c0c5ce;">            </span><span style="color:#b48ead;">return </span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">;  </span><span style="color:#65737e;">// Return false to finish
</span><span style="color:#c0c5ce;">        });
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-style:italic;color:#969896;">// With known size (sets Content-Length)
</span><span style="color:#323232;">svr.Get(</span><span style="color:#183691;">&quot;/file&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> size </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#323232;">get_file_size(</span><span style="color:#183691;">&quot;large.bin&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">    res.set_content_provider(size, </span><span style="color:#183691;">&quot;application/octet-stream&quot;</span><span style="color:#323232;">,
</span><span style="color:#323232;">        [](</span><span style="color:#0086b3;">size_t</span><span style="color:#323232;"> offset, </span><span style="color:#0086b3;">size_t</span><span style="color:#323232;"> length, httplib::DataSink </span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;">sink) {
</span><span style="color:#323232;">            </span><span style="font-style:italic;color:#969896;">// Send &#39;length&#39; bytes starting from &#39;offset&#39;
</span><span style="color:#323232;">            </span><span style="font-weight:bold;color:#a71d5d;">return </span><span style="color:#0086b3;">true</span><span style="color:#323232;">;
</span><span style="color:#323232;">        });
</span><span style="color:#323232;">});
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;">// Unknown size (Chunked Transfer Encoding)
</span><span style="color:#323232;">svr.Get(</span><span style="color:#183691;">&quot;/stream&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    res.set_chunked_content_provider(</span><span style="color:#183691;">&quot;text/plain&quot;</span><span style="color:#323232;">,
</span><span style="color:#323232;">        [](</span><span style="color:#0086b3;">size_t</span><span style="color:#323232;"> offset, httplib::DataSink </span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;">sink) {
</span><span style="color:#323232;">            sink.write(</span><span style="color:#183691;">&quot;chunk</span><span style="color:#0086b3;">\n</span><span style="color:#183691;">&quot;</span><span style="color:#323232;">, </span><span style="color:#0086b3;">6</span><span style="color:#323232;">);
</span><span style="color:#323232;">            </span><span style="font-weight:bold;color:#a71d5d;">return </span><span style="color:#0086b3;">true</span><span style="color:#323232;">;  </span><span style="font-style:italic;color:#969896;">// Return false to finish
</span><span style="color:#323232;">        });
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<p>For uploading large files, <code>make_file_provider()</code> comes in handy. It streams the file instead of loading it all into memory.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">http://localhost:8080</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> res = cli.</span><span style="color:#8fa1b3;">Post</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/upload</span><span style="color:#c0c5ce;">&quot;, {}, {
</span><span style="color:#c0c5ce;">    </span><span style="color:#8fa1b3;">httplib::make_file_provider</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">file</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">/path/to/large-file.zip</span><span style="color:#c0c5ce;">&quot;)
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;http://localhost:8080&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> res </span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;"> cli.Post(</span><span style="color:#183691;">&quot;/upload&quot;</span><span style="color:#323232;">, {}, {
</span><span style="color:#323232;">    httplib::make_file_provider(</span><span style="color:#183691;">&quot;file&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;/path/to/large-file.zip&quot;</span><span style="color:#323232;">)
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<h2>Server-Sent Events (SSE)</h2>
<p>We provide an SSE client as well. It supports automatic reconnection and resuming via <code>Last-Event-ID</code>.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">http://localhost:8080</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">httplib::sse::SSEClient </span><span style="color:#8fa1b3;">sse</span><span style="color:#c0c5ce;">(</span><span style="color:#bf616a;">cli</span><span style="color:#c0c5ce;">, &quot;</span><span style="color:#a3be8c;">/events</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">sse.</span><span style="color:#8fa1b3;">on_message</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const</span><span style="color:#c0c5ce;"> httplib::sse::SSEMessage &amp;msg) {
</span><span style="color:#c0c5ce;">    std::cout &lt;&lt; msg.</span><span style="color:#bf616a;">event </span><span style="color:#c0c5ce;">&lt;&lt; &quot;</span><span style="color:#a3be8c;">: </span><span style="color:#c0c5ce;">&quot; &lt;&lt; msg.</span><span style="color:#bf616a;">data </span><span style="color:#c0c5ce;">&lt;&lt; std::endl;
</span><span style="color:#c0c5ce;">});
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">sse.</span><span style="color:#8fa1b3;">start</span><span style="color:#c0c5ce;">();  </span><span style="color:#65737e;">// Blocking, with auto-reconnection
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;http://localhost:8080&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">httplib::sse::SSEClient </span><span style="font-weight:bold;color:#795da3;">sse</span><span style="color:#323232;">(cli, </span><span style="color:#183691;">&quot;/events&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="color:#323232;">sse.on_message([](</span><span style="font-weight:bold;color:#a71d5d;">const</span><span style="color:#323232;"> httplib::sse::SSEMessage </span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;">msg) {
</span><span style="color:#323232;">    std::cout </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> msg.event </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt; </span><span style="color:#183691;">&quot;: &quot; </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> msg.data </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> std::endl;
</span><span style="color:#323232;">});
</span><span style="color:#323232;">
</span><span style="color:#323232;">sse.start();  </span><span style="font-style:italic;color:#969896;">// Blocking, with auto-reconnection
</span></pre>
</div></div>
<p>You can also set separate handlers for each event type.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">sse.</span><span style="color:#8fa1b3;">on_event</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">update</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#c0c5ce;"> httplib::sse::SSEMessage &amp;msg) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#65737e;">// Only handles &quot;update&quot; events
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">sse.on_event(</span><span style="color:#183691;">&quot;update&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const</span><span style="color:#323232;"> httplib::sse::SSEMessage </span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;">msg) {
</span><span style="color:#323232;">    </span><span style="font-style:italic;color:#969896;">// Only handles &quot;update&quot; events
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<h2>Authentication</h2>
<p>The client has helpers for Basic auth, Bearer Token auth, and Digest auth.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://api.example.com</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_basic_auth</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">user</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">password</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_bearer_token_auth</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">my-token</span><span style="color:#c0c5ce;">&quot;);
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;https://api.example.com&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_basic_auth(</span><span style="color:#183691;">&quot;user&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;password&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_bearer_token_auth(</span><span style="color:#183691;">&quot;my-token&quot;</span><span style="color:#323232;">);
</span></pre>
</div></div>
<h2>Compression</h2>
<p>We support compression and decompression with gzip, Brotli, and Zstandard. Define the corresponding macro when you compile.</p>
<table><thead><tr><th>Method</th><th>Macro</th></tr></thead><tbody>
<tr><td>gzip</td><td><code>CPPHTTPLIB_ZLIB_SUPPORT</code></td></tr>
<tr><td>Brotli</td><td><code>CPPHTTPLIB_BROTLI_SUPPORT</code></td></tr>
<tr><td>Zstandard</td><td><code>CPPHTTPLIB_ZSTD_SUPPORT</code></td></tr>
</tbody></table>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://example.com</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_compress</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">);    </span><span style="color:#65737e;">// Compress request body
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_decompress</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">);  </span><span style="color:#65737e;">// Decompress response body
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;https://example.com&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_compress(</span><span style="color:#0086b3;">true</span><span style="color:#323232;">);    </span><span style="font-style:italic;color:#969896;">// Compress request body
</span><span style="color:#323232;">cli.set_decompress(</span><span style="color:#0086b3;">true</span><span style="color:#323232;">);  </span><span style="font-style:italic;color:#969896;">// Decompress response body
</span></pre>
</div></div>
<h2>Proxy</h2>
<p>You can connect through an HTTP proxy.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://example.com</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_proxy</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">proxy.example.com</span><span style="color:#c0c5ce;">&quot;, </span><span style="color:#d08770;">8080</span><span style="color:#c0c5ce;">);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_proxy_basic_auth</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">user</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">password</span><span style="color:#c0c5ce;">&quot;);
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;https://example.com&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_proxy(</span><span style="color:#183691;">&quot;proxy.example.com&quot;</span><span style="color:#323232;">, </span><span style="color:#0086b3;">8080</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_proxy_basic_auth(</span><span style="color:#183691;">&quot;user&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;password&quot;</span><span style="color:#323232;">);
</span></pre>
</div></div>
<h2>Timeouts</h2>
<p>You can set connection, read, and write timeouts individually.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://example.com</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_connection_timeout</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">5</span><span style="color:#c0c5ce;">, </span><span style="color:#d08770;">0</span><span style="color:#c0c5ce;">);  </span><span style="color:#65737e;">// 5 seconds
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_read_timeout</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">10</span><span style="color:#c0c5ce;">, </span><span style="color:#d08770;">0</span><span style="color:#c0c5ce;">);       </span><span style="color:#65737e;">// 10 seconds
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_write_timeout</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">10</span><span style="color:#c0c5ce;">, </span><span style="color:#d08770;">0</span><span style="color:#c0c5ce;">);      </span><span style="color:#65737e;">// 10 seconds
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;https://example.com&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_connection_timeout(</span><span style="color:#0086b3;">5</span><span style="color:#323232;">, </span><span style="color:#0086b3;">0</span><span style="color:#323232;">);  </span><span style="font-style:italic;color:#969896;">// 5 seconds
</span><span style="color:#323232;">cli.set_read_timeout(</span><span style="color:#0086b3;">10</span><span style="color:#323232;">, </span><span style="color:#0086b3;">0</span><span style="color:#323232;">);       </span><span style="font-style:italic;color:#969896;">// 10 seconds
</span><span style="color:#323232;">cli.set_write_timeout(</span><span style="color:#0086b3;">10</span><span style="color:#323232;">, </span><span style="color:#0086b3;">0</span><span style="color:#323232;">);      </span><span style="font-style:italic;color:#969896;">// 10 seconds
</span></pre>
</div></div>
<h2>Keep-Alive</h2>
<p>If you're making multiple requests to the same server, enable Keep-Alive. It reuses the TCP connection, which is much more efficient.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://example.com</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_keep_alive</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">true</span><span style="color:#c0c5ce;">);
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;https://example.com&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_keep_alive(</span><span style="color:#0086b3;">true</span><span style="color:#323232;">);
</span></pre>
</div></div>
<h2>Server Middleware</h2>
<p>You can hook into request processing before and after handlers run.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_pre_routing_handler</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#65737e;">// Runs before every request
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">return</span><span style="color:#c0c5ce;"> httplib::Server::HandlerResponse::Unhandled;  </span><span style="color:#65737e;">// Continue to normal routing
</span><span style="color:#c0c5ce;">});
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_post_routing_handler</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#65737e;">// Runs after the response is sent
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_header</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">X-Server</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">cpp-httplib</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">svr.set_pre_routing_handler([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    </span><span style="font-style:italic;color:#969896;">// Runs before every request
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">return</span><span style="color:#323232;"> httplib::Server::HandlerResponse::Unhandled;  </span><span style="font-style:italic;color:#969896;">// Continue to normal routing
</span><span style="color:#323232;">});
</span><span style="color:#323232;">
</span><span style="color:#323232;">svr.set_post_routing_handler([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    </span><span style="font-style:italic;color:#969896;">// Runs after the response is sent
</span><span style="color:#323232;">    res.set_header(</span><span style="color:#183691;">&quot;X-Server&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;cpp-httplib&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<p>Use <code>req.user_data</code> to pass data from middleware to handlers. This is useful for sharing things like decoded auth tokens.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_pre_routing_handler</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    req.</span><span style="color:#bf616a;">user_data</span><span style="color:#c0c5ce;">[&quot;</span><span style="color:#a3be8c;">auth_user</span><span style="color:#c0c5ce;">&quot;] = </span><span style="color:#8fa1b3;">std::string</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">alice</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">return</span><span style="color:#c0c5ce;"> httplib::Server::HandlerResponse::Unhandled;
</span><span style="color:#c0c5ce;">});
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/me</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    </span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> user = std::</span><span style="color:#8fa1b3;">any_cast</span><span style="color:#c0c5ce;">&lt;std::string&gt;(req.</span><span style="color:#bf616a;">user_data</span><span style="color:#c0c5ce;">.</span><span style="color:#8fa1b3;">at</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">auth_user</span><span style="color:#c0c5ce;">&quot;));
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">Hello, </span><span style="color:#c0c5ce;">&quot; + user, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">svr.set_pre_routing_handler([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    req.user_data[</span><span style="color:#183691;">&quot;auth_user&quot;</span><span style="color:#323232;">] </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#323232;">std::string(</span><span style="color:#183691;">&quot;alice&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">return</span><span style="color:#323232;"> httplib::Server::HandlerResponse::Unhandled;
</span><span style="color:#323232;">});
</span><span style="color:#323232;">
</span><span style="color:#323232;">svr.Get(</span><span style="color:#183691;">&quot;/me&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    </span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> user </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#323232;">std::any_cast&lt;std::string&gt;(req.user_data.at(</span><span style="color:#183691;">&quot;auth_user&quot;</span><span style="color:#323232;">));
</span><span style="color:#323232;">    res.set_content(</span><span style="color:#183691;">&quot;Hello, &quot; </span><span style="font-weight:bold;color:#a71d5d;">+</span><span style="color:#323232;"> user, </span><span style="color:#183691;">&quot;text/plain&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<p>You can also customize error and exception handlers.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_error_handler</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">Custom Error Page</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">text/html</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">});
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_exception_handler</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res, std::exception_ptr ep) {
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#bf616a;">status </span><span style="color:#c0c5ce;">= </span><span style="color:#d08770;">500</span><span style="color:#c0c5ce;">;
</span><span style="color:#c0c5ce;">    res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">Internal Server Error</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">svr.set_error_handler([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    res.set_content(</span><span style="color:#183691;">&quot;Custom Error Page&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;text/html&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">});
</span><span style="color:#323232;">
</span><span style="color:#323232;">svr.set_exception_handler([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res, std::exception_ptr ep) {
</span><span style="color:#323232;">    res.status </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#0086b3;">500</span><span style="color:#323232;">;
</span><span style="color:#323232;">    res.set_content(</span><span style="color:#183691;">&quot;Internal Server Error&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;text/plain&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<h2>Logging</h2>
<p>You can set a logger on both the server and the client.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_logger</span><span style="color:#c0c5ce;">([](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;req, </span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;">    std::cout &lt;&lt; req.</span><span style="color:#bf616a;">method </span><span style="color:#c0c5ce;">&lt;&lt; &quot; &quot; &lt;&lt; req.</span><span style="color:#bf616a;">path </span><span style="color:#c0c5ce;">&lt;&lt; &quot; &quot; &lt;&lt; res.</span><span style="color:#bf616a;">status </span><span style="color:#c0c5ce;">&lt;&lt; std::endl;
</span><span style="color:#c0c5ce;">});
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">svr.set_logger([](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">req, </span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;">    std::cout </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> req.method </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt; </span><span style="color:#183691;">&quot; &quot; </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> req.path </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt; </span><span style="color:#183691;">&quot; &quot; </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> res.status </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> std::endl;
</span><span style="color:#323232;">});
</span></pre>
</div></div>
<h2>Unix Domain Socket</h2>
<p>In addition to TCP, we support Unix Domain Sockets. You can use them for inter-process communication on the same machine.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#65737e;">// Server
</span><span style="color:#c0c5ce;">httplib::Server svr;
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">set_address_family</span><span style="color:#c0c5ce;">(AF_UNIX);
</span><span style="color:#c0c5ce;">svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/tmp/httplib.sock</span><span style="color:#c0c5ce;">&quot;, </span><span style="color:#d08770;">0</span><span style="color:#c0c5ce;">);
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-style:italic;color:#969896;">// Server
</span><span style="color:#323232;">httplib::Server svr;
</span><span style="color:#323232;">svr.set_address_family(AF_UNIX);
</span><span style="color:#323232;">svr.listen(</span><span style="color:#183691;">&quot;/tmp/httplib.sock&quot;</span><span style="color:#323232;">, </span><span style="color:#0086b3;">0</span><span style="color:#323232;">);
</span></pre>
</div></div><div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#65737e;">// Client
</span><span style="color:#c0c5ce;">httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">http://localhost</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_address_family</span><span style="color:#c0c5ce;">(AF_UNIX);
</span><span style="color:#c0c5ce;">cli.</span><span style="color:#8fa1b3;">set_hostname_addr_map</span><span style="color:#c0c5ce;">({{&quot;</span><span style="color:#a3be8c;">localhost</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">/tmp/httplib.sock</span><span style="color:#c0c5ce;">&quot;}});
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> res = cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#c0c5ce;">&quot;);
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-style:italic;color:#969896;">// Client
</span><span style="color:#323232;">httplib::Client </span><span style="font-weight:bold;color:#795da3;">cli</span><span style="color:#323232;">(</span><span style="color:#183691;">&quot;http://localhost&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">cli.set_address_family(AF_UNIX);
</span><span style="color:#323232;">cli.set_hostname_addr_map({{</span><span style="color:#183691;">&quot;localhost&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;/tmp/httplib.sock&quot;</span><span style="color:#323232;">}});
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> res </span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;"> cli.Get(</span><span style="color:#183691;">&quot;/&quot;</span><span style="color:#323232;">);
</span></pre>
</div></div>
<h2>Learn More</h2>
<p>Want to dig deeper? Check out these resources.</p>
<ul>
<li>Cookbook — A collection of recipes for common use cases</li>
<li><a href="https://github.com/yhirose/cpp-httplib/blob/master/README.md">README</a> — Full API reference</li>
<li><a href="https://github.com/yhirose/cpp-httplib/blob/master/README-sse.md">README-sse</a> — How to use Server-Sent Events</li>
<li><a href="https://github.com/yhirose/cpp-httplib/blob/master/README-stream.md">README-stream</a> — How to use the Streaming API</li>
<li><a href="https://github.com/yhirose/cpp-httplib/blob/master/README-websocket.md">README-websocket</a> — How to use the WebSocket server</li>
</ul>

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