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<a href="/cpp-httplib/en/" class="header-title">cpp-httplib <span style="font-size:0.75em;font-weight:normal;margin-left:4px">v0.36.0</span></a>
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<li><a href="/cpp-httplib/en/tour/01-getting-started/" class="">Getting Started</a></li>
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<article>
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<h1>HTTPS Server</h1>
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<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>
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<p>A TLS server needs a server certificate and a private key, though. Let's get those ready first.</p>
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<h2>Creating a Self-Signed Certificate</h2>
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<p>For development and testing, a self-signed certificate works just fine. You can generate one quickly with an OpenSSL command.</p>
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<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2d2d2d;">
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<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
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</span></pre>
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</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
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<span style="color:#323232;">openssl req -x509 -noenc -keyout key.pem -out cert.pem -subj /CN=localhost
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</span></pre>
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</div></div>
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<p>This creates two files:</p>
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<ul>
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<li><strong><code>cert.pem</code></strong> — Server certificate</li>
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<li><strong><code>key.pem</code></strong> — Private key</li>
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</ul>
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<h2>A Minimal HTTPS Server</h2>
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<p>Once you have your certificate, let's write the server.</p>
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<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">"</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">"
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;"><</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">>
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
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</span><span style="color:#d3d0c8;"> httplib::SSLServer </span><span style="color:#6699cc;">svr</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">cert.pem</span><span style="color:#d3d0c8;">", "</span><span style="color:#99cc99;">key.pem</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">", [](</span><span style="color:#cc99cc;">const auto </span><span style="color:#d3d0c8;">&, </span><span style="color:#cc99cc;">auto </span><span style="color:#d3d0c8;">&res) {
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</span><span style="color:#d3d0c8;"> res.</span><span style="color:#6699cc;">set_content</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">Hello, HTTPS!</span><span style="color:#d3d0c8;">", "</span><span style="color:#99cc99;">text/plain</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;"> });
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#d3d0c8;"> std::cout << "</span><span style="color:#99cc99;">Listening on https://localhost:8443</span><span style="color:#d3d0c8;">" << std::endl;
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</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">listen</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">0.0.0.0</span><span style="color:#d3d0c8;">", </span><span style="color:#f99157;">8443</span><span style="color:#d3d0c8;">);
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</span><span style="color:#d3d0c8;">}
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</span></pre>
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</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
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<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">"httplib.h"
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;"><iostream>
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</span><span style="color:#323232;">
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</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
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</span><span style="color:#323232;"> httplib::SSLServer svr(</span><span style="color:#183691;">"cert.pem"</span><span style="color:#323232;">, </span><span style="color:#183691;">"key.pem"</span><span style="color:#323232;">);
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</span><span style="color:#323232;">
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</span><span style="color:#323232;"> svr.Get(</span><span style="color:#183691;">"/"</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const auto &</span><span style="color:#323232;">, </span><span style="font-weight:bold;color:#a71d5d;">auto &</span><span style="color:#323232;">res) {
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</span><span style="color:#323232;"> res.set_content(</span><span style="color:#183691;">"Hello, HTTPS!"</span><span style="color:#323232;">, </span><span style="color:#183691;">"text/plain"</span><span style="color:#323232;">);
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</span><span style="color:#323232;"> });
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</span><span style="color:#323232;">
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</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;"><< </span><span style="color:#183691;">"Listening on https://localhost:8443" </span><span style="font-weight:bold;color:#a71d5d;"><<</span><span style="color:#323232;"> std::endl;
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</span><span style="color:#323232;"> svr.listen(</span><span style="color:#183691;">"0.0.0.0"</span><span style="color:#323232;">, </span><span style="color:#0086b3;">8443</span><span style="color:#323232;">);
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</span><span style="color:#323232;">}
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</span></pre>
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</div></div>
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<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>
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<p>Compile and start it up.</p>
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<h2>Testing It Out</h2>
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<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>
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<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#6699cc;">curl</span><span style="color:#f2777a;"> -k</span><span style="color:#d3d0c8;"> https://localhost:8443/
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</span><span style="color:#747369;"># Hello, HTTPS!
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</span></pre>
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</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
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<span style="color:#323232;">curl -k https://localhost:8443/
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</span><span style="font-style:italic;color:#969896;"># Hello, HTTPS!
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</span></pre>
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</div></div>
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<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>
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<h2>Connecting from a Client</h2>
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<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>
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<h3>Option 1: Disable Certificate Verification</h3>
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<p>This is the quick and easy approach for development.</p>
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<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">"</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">"
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;"><</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">>
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
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</span><span style="color:#d3d0c8;"> httplib::Client </span><span style="color:#6699cc;">cli</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">https://localhost:8443</span><span style="color:#d3d0c8;">");
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</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;">);
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</span><span style="color:#d3d0c8;">
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</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;">("</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(res) {
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</span><span style="color:#d3d0c8;"> std::cout << res-></span><span style="color:#f2777a;">body </span><span style="color:#d3d0c8;"><< std::endl; </span><span style="color:#747369;">// Hello, HTTPS!
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</span><span style="color:#d3d0c8;"> }
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</span><span style="color:#d3d0c8;">}
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</span></pre>
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</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
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<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">"httplib.h"
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;"><iostream>
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</span><span style="color:#323232;">
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</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
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</span><span style="color:#323232;"> httplib::Client cli(</span><span style="color:#183691;">"https://localhost:8443"</span><span style="color:#323232;">);
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</span><span style="color:#323232;"> cli.enable_server_certificate_verification(</span><span style="color:#0086b3;">false</span><span style="color:#323232;">);
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</span><span style="color:#323232;">
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</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;">"/"</span><span style="color:#323232;">);
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</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">if </span><span style="color:#323232;">(res) {
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</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;"><<</span><span style="color:#323232;"> res->body </span><span style="font-weight:bold;color:#a71d5d;"><<</span><span style="color:#323232;"> std::endl; </span><span style="font-style:italic;color:#969896;">// Hello, HTTPS!
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</span><span style="color:#323232;"> }
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</span><span style="color:#323232;">}
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</span></pre>
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</div></div>
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<h3>Option 2: Specify the Self-Signed Certificate as a CA Certificate</h3>
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<p>This is the safer approach. You tell the client to trust <code>cert.pem</code> as a CA certificate.</p>
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<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">"</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">"
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</span><span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;"><</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">>
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
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</span><span style="color:#d3d0c8;"> httplib::Client </span><span style="color:#6699cc;">cli</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">https://localhost:8443</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;"> cli.</span><span style="color:#6699cc;">set_ca_cert_path</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">cert.pem</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;">
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</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;">("</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(res) {
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</span><span style="color:#d3d0c8;"> std::cout << res-></span><span style="color:#f2777a;">body </span><span style="color:#d3d0c8;"><< std::endl; </span><span style="color:#747369;">// Hello, HTTPS!
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</span><span style="color:#d3d0c8;"> }
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</span><span style="color:#d3d0c8;">}
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</span></pre>
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</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
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<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">"httplib.h"
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</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;"><iostream>
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</span><span style="color:#323232;">
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</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
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</span><span style="color:#323232;"> httplib::Client cli(</span><span style="color:#183691;">"https://localhost:8443"</span><span style="color:#323232;">);
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</span><span style="color:#323232;"> cli.set_ca_cert_path(</span><span style="color:#183691;">"cert.pem"</span><span style="color:#323232;">);
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</span><span style="color:#323232;">
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</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;">"/"</span><span style="color:#323232;">);
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</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">if </span><span style="color:#323232;">(res) {
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|
</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;"><<</span><span style="color:#323232;"> res->body </span><span style="font-weight:bold;color:#a71d5d;"><<</span><span style="color:#323232;"> std::endl; </span><span style="font-style:italic;color:#969896;">// Hello, HTTPS!
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</span><span style="color:#323232;"> }
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</span><span style="color:#323232;">}
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</span></pre>
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</div></div>
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<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>
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<h2>Comparing Server and SSLServer</h2>
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<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>
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<table><thead><tr><th></th><th><code>httplib::Server</code></th><th><code>httplib::SSLServer</code></th></tr></thead><tbody>
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<tr><td>Constructor</td><td>No arguments</td><td>Certificate and private key paths</td></tr>
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<tr><td>Protocol</td><td>HTTP</td><td>HTTPS</td></tr>
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<tr><td>Port (convention)</td><td>8080</td><td>8443</td></tr>
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<tr><td>Routing</td><td>Same</td><td>Same</td></tr>
|
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</tbody></table>
|
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<p>To switch an HTTP server to HTTPS, just change the constructor.</p>
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<h2>Next Steps</h2>
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<p>Your HTTPS server is up and running. You now have the basics of both HTTP/HTTPS clients and servers covered.</p>
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<p>Next, let's look at the WebSocket support that was recently added to cpp-httplib.</p>
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<p><strong>Next:</strong> <a href="../08-websocket">WebSocket</a></p>
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