http: add --strip-path-slash and CURLOPT_STRIP_PATH_SLASH

... to enable sending "OPTIONS *" which wasn't possible previously.

This option currently only works for HTTP.

Added test cases 1298 + 1299 to verify

Fixes #1280
Closes #1462

lib/http.c

@@ -1851,6 +1851,9 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
       case HTTPREQ_PUT:
         request = "PUT";
         break;
+      case HTTPREQ_OPTIONS:
+        request = "OPTIONS";
+        break;
       default: /* this should never happen */
       case HTTPREQ_GET:
         request = "GET";
@@ -2266,6 +2269,9 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
   if(result)
     return result;
 
+  if(data->set.strip_path_slash)
+    ppath++;
+
   /* url */
   if(paste_ftp_userpwd)
     result = Curl_add_bufferf(req_buffer, "ftp://%s:%s@%s",

lib/url.c

@@ -829,6 +829,10 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
          then this can be changed to HEAD later on) */
       data->set.httpreq = HTTPREQ_GET;
     break;
+  case CURLOPT_STRIP_PATH_SLASH:
+    arg = va_arg(param, long);
+    data->set.strip_path_slash = (bool)arg;
+    break;
   case CURLOPT_FILETIME:
     /*
      * Try to get the file time of the remote document. The time will

lib/urldata.h

@@ -1264,6 +1264,7 @@ typedef enum {
   HTTPREQ_POST_FORM, /* we make a difference internally */
   HTTPREQ_PUT,
   HTTPREQ_HEAD,
+  HTTPREQ_OPTIONS,
   HTTPREQ_CUSTOM,
   HTTPREQ_LAST /* last in list */
 } Curl_HttpReq;
@@ -1698,6 +1699,7 @@ struct UserDefined {
   Curl_HttpReq httpreq;   /* what kind of HTTP request (if any) is this */
   long httpversion; /* when non-zero, a specific HTTP version requested to
                        be used in the library's request(s) */
+  bool strip_path_slash; /* strip off initial slash from path */
   struct ssl_config_data ssl;  /* user defined SSL stuff */
   struct ssl_config_data proxy_ssl;  /* user defined SSL stuff for proxy */
   struct ssl_general_config general_ssl; /* general user defined SSL stuff */