[Privoxy-users] Connection header

[Fabian Keil]

Matthew Painter <matthew.painter at import.io> wrote:

> Wondering why privoxy doesn't include Connection header (i.e. swap the
> Proxy-Connection header out for it) when keep-alive is turned on in the
> config - is this by design? Currently I'm putting it back in via an action
> and then using the headers sorting but seems odd.

In case of HTTP/1.1, not sending any Connection header implies
interest to keep the connection alive.

If you use a client that doesn't set a "Connection: keep-alive" header,
letting Privoxy add the header lets the request stand out (assuming
someone is checking for header differences and/or trying to fingerprint
clients) without providing any obvious benefit.

If the header is already set, Privoxy will not remove it by default
(if keep-alive support is enabled)  so I'm not sure why you used
the phrase "putting it back in".

You can enable "debug 8" to see what's going. If the header is kept,
you should see messages like:
15:03:48.203 014 Header: Keeping the client header 'Connection: keep-alive' around. The server connection will be kept alive if possible.

Fabian
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