MXS-1220: Add HEAD method support

The HEAD method was not in the list of supported methods.

server/core/maxscale/http.hh

@@ -28,7 +28,8 @@ enum http_verb
     HTTP_PUT,
     HTTP_POST,
     HTTP_OPTIONS,
-    HTTP_PATCH
+    HTTP_PATCH,
+    HTTP_HEAD
 };
 
 /** Possible HTTP return codes */
@@ -101,6 +102,10 @@ static inline enum http_verb string_to_http_verb(string& verb)
     {
         return HTTP_OPTIONS;
     }
+    else if (verb == "HEAD")
+    {
+        return HTTP_HEAD;
+    }
 
     return HTTP_UNKNOWN;
 }
@@ -126,6 +131,8 @@ static inline const char* http_verb_to_string(enum http_verb verb)
         return "PATCH";
     case HTTP_OPTIONS:
         return "OPTIONS";
+    case HTTP_HEAD:
+        return "HEAD";
     default:
         return "UNKNOWN";
     }

server/core/test/testhttp.cc

@@ -27,6 +27,7 @@ const char* verbs_pass[] =
     "POST",
     "OPTIONS",
     "PATCH",
+    "HEAD",
     NULL
 };
 
@@ -264,12 +265,23 @@ const char* body_fail[] =
     NULL
 };
 
+const char* body_verbs_pass[] =
+{
+    "PUT",
+    "POST",
+    "PATCH",
+    NULL
+};
+
 int test_message_body()
 {
     for (int i = 0; body_pass[i]; i++)
     {
+        for (int j = 0; body_verbs_pass[j]; j++)
+        {
+            /** Only PUT/POST/PATCH methods should have request bodies */
             stringstream ss;
-        ss << "GET / HTTP/1.1\r\n\r\n" << body_pass[i];
+            ss << body_verbs_pass[j] << " / HTTP/1.1\r\n\r\n" << body_pass[i];
             SHttpRequest parser(HttpRequest::parse(ss.str()));
             TEST(parser.get() != NULL, "Valid request body should be parsed: %s",
                  ss.str().c_str());
@@ -277,15 +289,19 @@ int test_message_body()
             TEST(parser->get_json_str() == body_pass[i], "Body value should be correct: %s",
                  parser->get_json_str().c_str());
         }
+    }
 
     for (int i = 0; body_pass[i]; i++)
+    {
+        for (int j = 0; verbs_pass[j]; j++)
         {
             stringstream ss;
-        ss << "GET / HTTP/1.1\r\n\r\n" << body_fail[i];
+            ss << verbs_pass[j] << " / HTTP/1.1\r\n\r\n" << body_fail[i];
             SHttpRequest parser(HttpRequest::parse(ss.str()));
             TEST(parser.get() == NULL, "Invalid request body should not be parsed: %s",
                  ss.str().c_str());
         }
+    }
 
     return 0;
 }