[Caml-list] Sending message to Http_client

[Caml-list] Sending message to Http_client

[Gaurav Chanda]

Hello

I am trying to build a small http server that can interact with the existing Http_client module present in the Netclient Library.

I was succesful in establishing connection between the two. The data sent by the client was received sucesfully. However, sending data  back to the client is giving me problems.

I have written a loop in which my server writes "count" characters to the file descripter "fd"., using "Unix.write". The server gets out of the loop. However, on the client side, the function call "XmlRPCNet.handler#run" is not returning. 
It is supposed to store the response of the http request from the server, but is somehow not being able to do that. Or probably, I am doing something wrong.

Could you help me solve this problem ?

Regards
Gaurav


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Re: [Caml-list] Sending message to Http_client

[Shawn Wagner]

On Wed, Jun 12, 2002 at 06:18:03AM -0700, Gaurav Chanda wrote:
> Hello
> 

> I am trying to build a small http server that can interact with the
> existing Http_client module present in the Netclient Library.
>
> I was succesful in establishing connection between the two. The data sent
> by the client was received sucesfully. However, sending data back to the
> client is giving me problems.
>
> I have written a loop in which my server writes "count" characters to the
> file descripter "fd"., using "Unix.write". The server gets out of the loop.
> However, on the client side, the function call "XmlRPCNet.handler#run" is
> not returning.
>
> It is supposed to store the response of the http request from the server,
> but is somehow not being able to do that. Or probably, I am doing something
> wrong.
> 
> Could you help me solve this problem ?
> 

Normally, the Http_client.pipeline run method will return when the pipeline
is empty, or raise an exception. My XML-RPC code you're working from will,
if the run method raises an exception, re-call it. It's been a while since
I've had time to work on it, and I'm afraid I'm a bit sparse on comments,
but I think I did this to deal with a problem in non-blocking connects that
take a while to complete. If I recall correctly, some exeception handlers in
Http_client weren't getting invoked when they should have, but this problem
went away after one of the times I recompiled it (And I've never seen it
happen since, which is why I never reported a bug). I kept my attempt at a
workaround in the XML-RPC code in place just in case. So, a possible
explanation, assuming the server bits are working as intended: The run
method is getting called (Possibly more than once) with something in the
Http_client.pipeline that's not completing, causing to poll forever waiting
for more information. Have you tried changing the Http_client.pipeline
options in xmlRPCNet.ml to set all the verbose options true for better
debugging of just where it's running into problems?

-- 
Shawn Wagner
shawnw@speakeasy.org
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