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<h1>HTTPS Server</h1>
<p>In the previous chapter, you used an HTTPS client. Now let's set up your own HTTPS server. Just swap <code>httplib::Server</code> from Chapter 3 with <code>httplib::SSLServer</code>.</p>
<p>A TLS server needs a server certificate and a private key, though. Let's get those ready first.</p>
<h2>Creating a Self-Signed Certificate</h2>
<p>For development and testing, a self-signed certificate works just fine. You can generate one quickly with an OpenSSL command.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#6699cc;">openssl</span><span style="color:#d3d0c8;"> req</span><span style="color:#f2777a;"> -x509 -noenc -keyout</span><span style="color:#d3d0c8;"> key.pem</span><span style="color:#f2777a;"> -out</span><span style="color:#d3d0c8;"> cert.pem</span><span style="color:#f2777a;"> -subj</span><span style="color:#d3d0c8;"> /CN=localhost
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#8fa1b3;">openssl</span><span style="color:#4f5b66;"> req</span><span style="color:#bf616a;"> -x509 -noenc -keyout</span><span style="color:#4f5b66;"> key.pem</span><span style="color:#bf616a;"> -out</span><span style="color:#4f5b66;"> cert.pem</span><span style="color:#bf616a;"> -subj</span><span style="color:#4f5b66;"> /CN=localhost
</span></pre>
</div>
<p>This creates two files:</p>
<ul>
<li><strong><code>cert.pem</code></strong> — Server certificate</li>
<li><strong><code>key.pem</code></strong> — Private key</li>
</ul>
<h2>A Minimal HTTPS Server</h2>
<p>Once you have your certificate, let's write the server.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&quot;</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">&quot;
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&lt;</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">&gt;
</span><span style="color:#d3d0c8;">
</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
</span><span style="color:#d3d0c8;"> httplib::SSLServer </span><span style="color:#6699cc;">svr</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">cert.pem</span><span style="color:#d3d0c8;">&quot;, &quot;</span><span style="color:#99cc99;">key.pem</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const auto </span><span style="color:#d3d0c8;">&amp;, </span><span style="color:#cc99cc;">auto </span><span style="color:#d3d0c8;">&amp;res) {
</span><span style="color:#d3d0c8;"> res.</span><span style="color:#6699cc;">set_content</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">Hello, HTTPS!</span><span style="color:#d3d0c8;">&quot;, &quot;</span><span style="color:#99cc99;">text/plain</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> });
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> std::cout &lt;&lt; &quot;</span><span style="color:#99cc99;">Listening on https://localhost:8443</span><span style="color:#d3d0c8;">&quot; &lt;&lt; std::endl;
</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">listen</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">0.0.0.0</span><span style="color:#d3d0c8;">&quot;, </span><span style="color:#f99157;">8443</span><span style="color:#d3d0c8;">);
</span><span style="color:#d3d0c8;">}
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#b48ead;">#define </span><span style="color:#4f5b66;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#4f5b66;">&gt;
</span><span style="color:#4f5b66;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
</span><span style="color:#4f5b66;"> httplib::SSLServer </span><span style="color:#8fa1b3;">svr</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">cert.pem</span><span style="color:#4f5b66;">&quot;, &quot;</span><span style="color:#a3be8c;">key.pem</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const auto </span><span style="color:#4f5b66;">&amp;, </span><span style="color:#b48ead;">auto </span><span style="color:#4f5b66;">&amp;res) {
</span><span style="color:#4f5b66;"> res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">Hello, HTTPS!</span><span style="color:#4f5b66;">&quot;, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> });
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Listening on https://localhost:8443</span><span style="color:#4f5b66;">&quot; &lt;&lt; std::endl;
</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">0.0.0.0</span><span style="color:#4f5b66;">&quot;, </span><span style="color:#d08770;">8443</span><span style="color:#4f5b66;">);
</span><span style="color:#4f5b66;">}
</span></pre>
</div>
<p>Just pass the certificate and private key paths to the <code>httplib::SSLServer</code> constructor. The routing API is exactly the same as <code>httplib::Server</code> from Chapter 3.</p>
<p>Compile and start it up.</p>
<h2>Testing It Out</h2>
<p>With the server running, try accessing it with <code>curl</code>. Since we're using a self-signed certificate, add the <code>-k</code> option to skip certificate verification.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#6699cc;">curl</span><span style="color:#f2777a;"> -k</span><span style="color:#d3d0c8;"> https://localhost:8443/
</span><span style="color:#747369;"># Hello, HTTPS!
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#8fa1b3;">curl</span><span style="color:#bf616a;"> -k</span><span style="color:#4f5b66;"> https://localhost:8443/
</span><span style="color:#a7adba;"># Hello, HTTPS!
</span></pre>
</div>
<p>If you open <code>https://localhost:8443</code> in a browser, you'll see a "This connection is not secure" warning. That's expected with a self-signed certificate. Just proceed past it.</p>
<h2>Connecting from a Client</h2>
<p>Let's connect using <code>httplib::Client</code> from the previous chapter. There are two ways to connect to a server with a self-signed certificate.</p>
<h3>Option 1: Disable Certificate Verification</h3>
<p>This is the quick and easy approach for development.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&quot;</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">&quot;
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&lt;</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">&gt;
</span><span style="color:#d3d0c8;">
</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
</span><span style="color:#d3d0c8;"> httplib::Client </span><span style="color:#6699cc;">cli</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">https://localhost:8443</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> cli.</span><span style="color:#6699cc;">enable_server_certificate_verification</span><span style="color:#d3d0c8;">(</span><span style="color:#f99157;">false</span><span style="color:#d3d0c8;">);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">auto</span><span style="color:#d3d0c8;"> res = cli.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(res) {
</span><span style="color:#d3d0c8;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#f2777a;">body </span><span style="color:#d3d0c8;">&lt;&lt; std::endl; </span><span style="color:#747369;">// Hello, HTTPS!
</span><span style="color:#d3d0c8;"> }
</span><span style="color:#d3d0c8;">}
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#b48ead;">#define </span><span style="color:#4f5b66;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#4f5b66;">&gt;
</span><span style="color:#4f5b66;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
</span><span style="color:#4f5b66;"> httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">https://localhost:8443</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> cli.</span><span style="color:#8fa1b3;">enable_server_certificate_verification</span><span style="color:#4f5b66;">(</span><span style="color:#d08770;">false</span><span style="color:#4f5b66;">);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> </span><span style="color:#b48ead;">auto</span><span style="color:#4f5b66;"> res = cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(res) {
</span><span style="color:#4f5b66;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#bf616a;">body </span><span style="color:#4f5b66;">&lt;&lt; std::endl; </span><span style="color:#a7adba;">// Hello, HTTPS!
</span><span style="color:#4f5b66;"> }
</span><span style="color:#4f5b66;">}
</span></pre>
</div>
<h3>Option 2: Specify the Self-Signed Certificate as a CA Certificate</h3>
<p>This is the safer approach. You tell the client to trust <code>cert.pem</code> as a CA certificate.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&quot;</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">&quot;
</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&lt;</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">&gt;
</span><span style="color:#d3d0c8;">
</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
</span><span style="color:#d3d0c8;"> httplib::Client </span><span style="color:#6699cc;">cli</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">https://localhost:8443</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> cli.</span><span style="color:#6699cc;">set_ca_cert_path</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">cert.pem</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">auto</span><span style="color:#d3d0c8;"> res = cli.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(res) {
</span><span style="color:#d3d0c8;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#f2777a;">body </span><span style="color:#d3d0c8;">&lt;&lt; std::endl; </span><span style="color:#747369;">// Hello, HTTPS!
</span><span style="color:#d3d0c8;"> }
</span><span style="color:#d3d0c8;">}
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#b48ead;">#define </span><span style="color:#4f5b66;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#4f5b66;">&gt;
</span><span style="color:#4f5b66;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
</span><span style="color:#4f5b66;"> httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">https://localhost:8443</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> cli.</span><span style="color:#8fa1b3;">set_ca_cert_path</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">cert.pem</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> </span><span style="color:#b48ead;">auto</span><span style="color:#4f5b66;"> res = cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(res) {
</span><span style="color:#4f5b66;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#bf616a;">body </span><span style="color:#4f5b66;">&lt;&lt; std::endl; </span><span style="color:#a7adba;">// Hello, HTTPS!
</span><span style="color:#4f5b66;"> }
</span><span style="color:#4f5b66;">}
</span></pre>
</div>
<p>This way, only connections to the server with that specific certificate are allowed, preventing impersonation. Use this approach whenever possible, even in test environments.</p>
<h2>Comparing Server and SSLServer</h2>
<p>The <code>httplib::Server</code> API you learned in Chapter 3 works exactly the same with <code>httplib::SSLServer</code>. The only difference is the constructor.</p>
<table><thead><tr><th></th><th><code>httplib::Server</code></th><th><code>httplib::SSLServer</code></th></tr></thead><tbody>
<tr><td>Constructor</td><td>No arguments</td><td>Certificate and private key paths</td></tr>
<tr><td>Protocol</td><td>HTTP</td><td>HTTPS</td></tr>
<tr><td>Port (convention)</td><td>8080</td><td>8443</td></tr>
<tr><td>Routing</td><td>Same</td><td>Same</td></tr>
</tbody></table>
<p>To switch an HTTP server to HTTPS, just change the constructor.</p>
<h2>Next Steps</h2>
<p>Your HTTPS server is up and running. You now have the basics of both HTTP/HTTPS clients and servers covered.</p>
<p>Next, let's look at the WebSocket support that was recently added to cpp-httplib.</p>
<p><strong>Next:</strong> <a href="../08-websocket">WebSocket</a></p>
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