URL fetch request size in googleaapengine

I am doing a web application project using GWT in Eclipse.

I have a file on the client side which is to send on the
project.server and from server to external Repository.

File --> Client-->Server-->Repository Iam Using default SDk -
(appengine-java-sdk-1.6.3.1- 1.6.3)

GWT-2.4.0 according to documentation http://code.google.com/p/googleappengine/wiki/SdkReleaseNotes
, the limit

for URL fetch request is 5Mb.

** But I cannot fetch the request more then 3.8Mb **

If i try to fetch more then 3.8 Mb then it gives me an Error.

Cannot access http://URL: The request to API call urlfetch.Fetch()
was too large. Can somebody explain me the reason for this.

Even i have to download the file from repository and save it on client
side.

So is there any limitaion of size to getContent of the file present in
the Repository to the server Side.?

Thanks

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