missing return and new line in headers

Closes #22230

httpcomm.cpp

@@ -130,7 +130,7 @@ void HttpComm::requestThread(ChildThreadWrapper &aThread)
         password.empty() ? NULL : password.c_str(),
         &httpAuthInfo,
         ebuf, ebufSz,
-        "Content-Length: 0"
+        "Content-Length: 0\r\n"
         "%s"
         "\r\n",
         extraHeaders.c_str()