HTTP header 'Connection: Close' not sent by IE

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+1 Q:

HTTP header 'Connection: Close' not sent by IE

I have a custom HTTP server that implements the HTTP 1.1 protocol.

I have no problem using persistent connections, however, I never receive 'Connection: Close' from IE ( I haven't tested other browsers. ) Instead, the 'receive' times out because it seems IE closes the connection.

What header from IE should I look for to gracefully close the connection?

There is no requirement to have browser explicitly send Connection: Close. And it does timeouts in 60 seconds, which is defined in registry.

I don't see a problem to gracefully handle "manual" client disconnect.

BarsMonster 2010-08-29 02:46:05

It's not that it's a problem, as you word it. It's that it would be nice if it could be done gracefully. If that's not possible then I guess it's not a problem ;)

Bob Jacobs 2010-08-29 02:49:19

Well, even if browser would always send that, you will still need to handle the situation when connection drops gracefully.

BarsMonster 2010-08-29 03:25:20

+1 A:

The default setting of the "Connection" header in 1.1 is "keep-alive" when the header is not present. IE does not close the connection right away so it can utilize the same connection for subsequent requests, and then closes the connection after a timeout if you do not send any requests right away.

Remy Lebeau - TeamB 2010-08-29 05:29:18

So, should I send a '100 - continue' or just let the connection timeout?

Bob Jacobs 2010-08-29 15:01:15

You can only send a `100` reply if the client explicitally asks for it via an `Expect: 100-continue` header, and even then only in reply to a request that is pending. So you will just have to let your connection timeout normally. Like I said, even IE does not know right away whether a connection is going to be re-used or not, so it does not send a `Connection: close` header for HTTP 1.1 requests

Remy Lebeau - TeamB 2010-08-31 01:13:10

ansaurus

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HTTP header 'Connection: Close' not sent by IE

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