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Re: [lwip-users] LWIP Timeout(?) 2 second to ACKnowledge the endof the t
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From: |
Jeff Barber |
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Subject: |
Re: [lwip-users] LWIP Timeout(?) 2 second to ACKnowledge the endof the transmission. log file TC_IP trace2.pcap |
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Date: |
Thu, 14 Oct 2010 07:56:11 -0400 |
It appears that the browser is waiting about 1.35 seconds before
closing the connection after each request. I don't see any indication
that the lwIP side is doing anything wrong with respect to the TCP
session. Just a guess but any of several things might be confusing the
browser:
- You're giving a Content-length header but the length is incorrect:
your length says 19, but the actual length appears to be 27 (could it
be you're using %x instead of %d?).
- You're claiming to be an HTTP/1.1 server, but then the next header
says you're an HTTP/1.0 server; perhaps the browser is expecting to
receive an end-of-file from you? I.e. waiting for you to close the
connection, but eventually decides you must be done and does the close
itself.
- You have a couple of other duplicated headers in there: "Pragma:
no-cache" and "Cache-control: no-cache".
- You appear to have an <html> tag in the middle of your headers
rather than in the body.
- Some of your header lines are terminated by a single LF character
rather than CR-LF.
Hope this helps,
Jeff
On Thu, Oct 14, 2010 at 4:45 AM, Damon, Antoine <address@hidden> wrote:
> Hi
>
>
> I modified the response of the webserver. Now, there is no error in the log,
> but for
> each transfer the web server gives the order to open/close a connection. The
> stack need
> 1.4 secondes to open the connection, I would like to know how to reduce this
> time?
> You could see in the log line 21/22,36/37,48:49....
> Thanks for your help
> Best regards
> Antoine Damon
>
> -----Message d'origine-----
> De : address@hidden
> [mailto:address@hidden De la part de
> address@hidden
> Envoyé : mardi 5 octobre 2010 20:23
> À : Mailing list for lwIP users
> Objet : Re: [lwip-users] LWIP Timeout(?) 2 second to ACKnowledge the endof the
> transmission. log file TC_IP trace2.pcap
>
>
> Kieran Mansley wrote:
>> On Tue, 2010-10-05 at 09:48 -0400, Damon, Antoine wrote:
>>> Have you got an idea about this timeout(?).
>> Sounds like the server is just waiting before closing the socket,
>> perhaps because it's giving the client a chance to send another request
>> but doesn't want to leave sockets open indefinitely.
> Well, that's a bit odd. An HTTP/1.1 server SHOULD use the
> "Content-Length" field to indicate the length of the body (RFC 2616,
> section 14.13). If this field is not given, the only means to tell the
> client that the body is finished is closing the connection (section
> 4.4). This is especially used when the webserver does not know the
> content length when sending the header (see below).
>
> Also, if "Content-Length" is missing, the connection cannot be reused
> since the client does not know when the server has finished the previous
> body.
>
> Looks like a bug in the Go-Ahead webserver (well, it's not violating the
> RFC, it's a bit slow only). But it could well be produced by the
> application running the webserver as the data returned seems to be
> generated rather than compiled-in. In this case, the server might not
> know the body length in advance and gets informed too late that the end
> is rechached.
>
> Maybe you might want to check your application code in that direction...
>
> Simon
>
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