http: make DELETE requests set `req.method`

Fixes #6461.

lib/_http_common.js

@@ -27,6 +27,7 @@ var IncomingMessage = incoming.IncomingMessage;
 var readStart = incoming.readStart;
 var readStop = incoming.readStop;
 
+var isNumber = require('util').isNumber;
 var debug = require('util').debuglog('http');
 exports.debug = debug;
 
@@ -90,7 +91,7 @@ function parserOnHeadersComplete(info) {
 
   parser.incoming._addHeaderLines(headers, n);
 
-  if (info.method) {
+  if (isNumber(info.method)) {
     // server only
     parser.incoming.method = HTTPParser.methods[info.method];
   } else {

test/simple/test-http-request-methods.js

@@ -24,9 +24,9 @@ var assert = require('assert');
 var net = require('net');
 var http = require('http');
 
-// Test that the PATCH and PURGE verbs get passed through correctly
+// Test that the DELETE, PATCH and PURGE verbs get passed through correctly
 
-['PATCH', 'PURGE'].forEach(function(method, index) {
+['DELETE', 'PATCH', 'PURGE'].forEach(function(method, index) {
   var port = common.PORT + index;
 
   var server_response = '';