diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 14f7e96ec8aa..fd0a2342996c 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,20 @@
+2016-04-26  Fujii Hironori  <Hironori.Fujii@sony.com>
+
+        [curl] Requests interrupted when using https via proxy
+        https://bugs.webkit.org/show_bug.cgi?id=157028
+
+        Reviewed by Alex Christensen.
+
+        A proxy responds "200 Connection Established" to a CONNECT
+        method.  This response doesn't have Content-Type, then the
+        request is canceled due to a unsupported MIME type. This is not
+        a real response from the recipient server. It should not be
+        processed normally. Just ignore the response.
+
+        * platform/network/curl/ResourceHandleManager.cpp:
+        (WebCore::headerCallback):
+        Do nothing if httpCode is 0. This is the case of "200 Connection Established".
+
 2016-04-26  Chris Dumez  <cdumez@apple.com>
 
         Drop Dictionary from CanUseWTFOptionalForParameter()
diff --git a/Source/WebCore/platform/network/curl/ResourceHandleManager.cpp b/Source/WebCore/platform/network/curl/ResourceHandleManager.cpp
index a63a572f4ca3..3821fb991432 100644
--- a/Source/WebCore/platform/network/curl/ResourceHandleManager.cpp
+++ b/Source/WebCore/platform/network/curl/ResourceHandleManager.cpp
@@ -482,6 +482,10 @@ static size_t headerCallback(char* ptr, size_t size, size_t nmemb, void* data)
         long httpCode = 0;
         curl_easy_getinfo(h, CURLINFO_RESPONSE_CODE, &httpCode);
 
+        if (!httpCode) {
+            // Comes here when receiving 200 Connection Established. Just return.
+            return totalSize;
+        }
         if (isHttpInfo(httpCode)) {
             // Just return when receiving http info, e.g. HTTP/1.1 100 Continue.
             // If not, the request might be cancelled, because the MIME type will be empty for this response.