Test curl-impersonate's HTTP headers

Add tests to verify that the HTTP headers and HTTP/2 pseudo-headers
generated by curl-impersonate match the expected ones from the browser.

The test uses a local nghttpd HTTP/2 server instance with a self-signed
certificate.

tests/minicurl.c

@@ -12,6 +12,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <getopt.h>
+#include <stdbool.h>
 
 #include <curl/curl.h>
 
@@ -20,6 +21,7 @@ struct opts {
     char *outfile;
     uint16_t local_port_start;
     uint16_t local_port_end;
+    bool insecure;
     char *url;
 };
 
@@ -61,13 +63,15 @@ int parse_opts(int argc, char **argv, struct opts *opts)
 
     memset(opts, 0, sizeof(*opts));
 
+    opts->insecure = false;
+
     while (1) {
         int option_index = 0;
         static struct option long_options[] = {
             {"local-port", required_argument, NULL, 'l'}
         };
 
-        c = getopt_long(argc, argv, "o:", long_options, &option_index);
+        c = getopt_long(argc, argv, "o:k", long_options, &option_index);
         if (c == -1) {
             break;
         }
@@ -84,6 +88,9 @@ int parse_opts(int argc, char **argv, struct opts *opts)
         case 'o':
             opts->outfile = optarg;
             break;
+        case 'k':
+            opts->insecure = true;
+            break;
         }
     }
 
@@ -167,6 +174,19 @@ int main(int argc, char *argv[])
         }
     }
 
+    if (opts.insecure) {
+        c = curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
+        if (c) {
+            fprintf(stderr, "curl_easy_setopt(CURLOPT_SSL_VERIFYPEER) failed\n");
+            goto out;
+        }
+        c = curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
+        if (c) {
+            fprintf(stderr, "curl_easy_setopt(CURLOPT_SSL_VERIFYHOST) failed\n");
+            goto out;
+        }
+    }
+
     c = curl_easy_setopt(curl, CURLOPT_URL, opts.url);
     if (c) {
         fprintf(stderr, "curl_easy_setopt(CURLOPT_URL) failed\n");