David,
What is the <strong>exact</strong> version of JRE you are using? Early
releases of Sun's Java 1.4.0.x and 1.4.1.x were SO buggy that it is not
even worth the trouble looking onto the problem unless you can confirm
the problem is reproducible with Java 1.4.2.2 or above
Oleg
On Fri, 2004-07-09 at 19:37, David Tonhofer, m-plify S.A. wrote:
> Hello,
>
> I have spent the past few hours tracking down a problem that seems to
> occur if you push bytes too quickly over a socket. As it happened with
> HTTPClient, I though I might ask here. Maybe somebody has already heard
> about it and can tell me whether there is a simple trick I don't know about.
>
> First, this happens under W2K, with Sun JVM 1.4.1. Haven't tried it on
> Linux yet (if anyone is interested, let me know).
>
> The HTTPClient I use is the 2.0 version.
>
> The HTTP Server is a simple homegrown Java socket-handling framework
> it basically just reads the bytes from the InputStream that it obtains
> from the socket.
>
> Problem:
> --------
>
> If I issue HTTPClient POST requests really quickly (in this case, inside
> a tight loop), then the first two request are received ok. On the third request,
> the data written over the 'wire' (note that the network is not really involved,
> client and server are on the same machine) seems to be dropped on the floor, i.e.
> the server receives the HTTP header, the HTTP header endline, and I can see
> HTTPClient log that it wrote the request body, but the request body is never
> received on the server side, even if the server waits a whole minute. I have
> tried to use InputStream and BufferedInputStream, but to avail.
>
> Le fixe:
> --------
>
> What fixed the problem was the introduction of a little delay in
> org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpState state,
> HttpConnection conn),
> just before the 'flush' of the body. This (line 2322 in HttpMethodBase):
>
> ...
> writeRequestBody(state, conn);
> // make sure the entire request body has been sent
> conn.flushRequestOutputStream();
> ....
>
> is 'augmented' with this:
>
> ...
> writeRequestBody(state, conn);
> try {
> Thread.sleep(20);
> }
> catch (Exception exe) {
> }
> conn.flushRequestOutputStream();
> ...
>
> I think I have already encountered this problem with Java 1.2 a few years ago,
> also on W2K (indeed I have found a 500ms sleep in some old code I have been keeping
> around). Does anyone know if this is a common phenomenon?
>
> Best regards and thanks in advance for any clue,
>
> -- David Tonhofer
>
>
>
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