Improve console log message for CORS failure

Source/core/loader/CrossOriginPreflightResultCache.cpp

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 71 matching lines @@
     if (start != string.length())
         addToAccessControlAllowList(string, start, string.length() - 1, set);
 
     return true;
 }
 
 bool CrossOriginPreflightResultCacheItem::parse(const ResourceResponse& response, String& errorDescription)
 {
     m_methods.clear();
     if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Methods"), m_methods)) {
-        errorDescription = "Cannot parse Access-Control-Allow-Methods response header field.";
+        errorDescription = "Cannot parse Access-Control-Allow-Methods response header field in preflight response.";
         return false;
     }
 
     m_headers.clear();
     if (!parseAccessControlAllowList(response.httpHeaderField("Access-Control-Allow-Headers"), m_headers)) {
-        errorDescription = "Cannot parse Access-Control-Allow-Headers response header field.";
+        errorDescription = "Cannot parse Access-Control-Allow-Headers response header field in preflight response.";
         return false;
     }
 
     unsigned expiryDelta;
     if (parseAccessControlMaxAge(response.httpHeaderField("Access-Control-Max-Age"), expiryDelta)) {
         if (expiryDelta > maxPreflightCacheTimeoutSeconds)
             expiryDelta = maxPreflightCacheTimeoutSeconds;
     } else {
         expiryDelta = defaultPreflightCacheTimeoutSeconds;
     }
 
     m_absoluteExpiryTime = currentTime() + expiryDelta;
     return true;
 }
 
 bool CrossOriginPreflightResultCacheItem::allowsCrossOriginMethod(const String& method, String& errorDescription) const
 {
     if (m_methods.contains(method) || FetchUtils::isSimpleMethod(method))
         return true;
 
-    errorDescription = "Method " + method + " is not allowed by Access-Control-Allow-Methods.";
+    errorDescription = "Method " + method + " is not allowed by Access-Control-Allow-Methods in preflight response.";
     return false;
 }
 
 bool CrossOriginPreflightResultCacheItem::allowsCrossOriginHeaders(const HTTPHeaderMap& requestHeaders, String& errorDescription) const
 {
     for (const auto& header : requestHeaders) {
         if (!m_headers.contains(header.key) && !FetchUtils::isSimpleHeader(header.key, header.value) && !FetchUtils::isForbiddenHeaderName(header.key)) {
-            errorDescription = "Request header field " + header.key.string() + " is not allowed by Access-Control-Allow-Headers.";
+            errorDescription = "Request header field " + header.key.string() + " is not allowed by Access-Control-Allow-Headers in preflight response.";
             return false;
         }
     }
     return true;
 }
 
 bool CrossOriginPreflightResultCacheItem::allowsRequest(StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders) const
 {
     String ignoredExplanation;
     if (m_absoluteExpiryTime < currentTime())
@@ skipping 28 matching lines @@
         return false;
 
     if (cacheIt->value->allowsRequest(includeCredentials, method, requestHeaders))
         return true;
 
     m_preflightHashMap.remove(cacheIt);
     return false;
 }
 
 } // namespace blink