--- check_http.c.orig	2010-07-27 16:47:16.000000000 -0400
+++ check_http.c	2011-04-05 12:02:56.000000000 -0400
@@ -94,6 +94,7 @@
 char server_type[6] = "http";
 char *server_address;
 char *host_name;
+char *host_header;
 char *server_url;
 char *user_agent;
 int server_url_length;
@@ -346,6 +347,13 @@
     case 'u': /* URL path */
       server_url = strdup (optarg);
       server_url_length = strlen (server_url);
+      // Also set HTTP host header
+      char delim[] = "/";
+      if (!strncmp(optarg, "http://", 7) ) {
+          host_header=strdup(strtok(optarg+7, delim));
+      } else if (!strncmp(optarg, "https://", 8) ) {
+          host_header=strdup(strtok(optarg+8, delim));
+      }
       break;
     case 'p': /* Server port */
       if (!is_intnonneg (optarg))
@@ -823,7 +831,10 @@
   asprintf (&buf, "%sConnection: close\r\n", buf);
 
   /* optionally send the host header info */
-  if (host_name) {
+  if (!host_header) {
+      host_header=strdup(host_name);
+  }
+  if (host_header) {
     /*
      * Specify the port only if we're using a non-default port (see RFC 2616,
      * 14.23).  Some server applications/configurations cause trouble if the
@@ -831,9 +842,9 @@
      */
     if ((use_ssl == FALSE && server_port == HTTP_PORT) ||
         (use_ssl == TRUE && server_port == HTTPS_PORT))
-      asprintf (&buf, "%sHost: %s\r\n", buf, host_name);
+      asprintf (&buf, "%sHost: %s\r\n", buf, host_header);
     else
-      asprintf (&buf, "%sHost: %s:%d\r\n", buf, host_name, server_port);
+      asprintf (&buf, "%sHost: %s:%d\r\n", buf, host_header, server_port);
   }
 
   /* optionally send any other header tag */