One very simple idea is just use an epoch timestamp as a tracking, correlation header? Header set x-correlation-header "%t" (or RequestHeader)
x-correlation-header t=1602793505297786
-----Original Message-----
From: Eric Covener <covener@xxxxxxxxx>
Sent: Thursday, October 15, 2020 12:44 PM
To: users@xxxxxxxxxxxxxxxx
Subject: Re: Transaction/request token
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On Thu, Oct 15, 2020 at 3:30 PM Niranjan Rao <nhrdls@xxxxxxxxx> wrote:
>
> Greetings,
>
> On Ubuntu 20.04, apache version 2.4.29.
>
>
> I did obvious google searches, but may be I am missing right search
> terms and hence request for the help.
>
>
> We have bunch of services on back end servers and we use Apache proxy
> pass and related stuff. This all works perfectly and as documented.
>
>
> Often times we encounter a challenge of tracing the request to end
> server as there are multiple requests coming in to apache and they are
> all distributed to backend server which in turn can make calls to
> other servers. Is it possible to add some sort of transaction token as
> a header when we call proxy pass. We can log the headers at other end,
> carry it forward as needed. This will help us to collate the data and
> quickly figure out what we served for which request.
>
> Essentially, I am looking for adding a auto generated unique id to
> headers when proxy pass makes the call to backend. We can log the
> header in our logs or carry it further down as needed so that we can
> trace the flow end to end.
>
>
> Is this possible? If so, can you please help me by pointing out the
> documentation or steps.
You can load mod_uniqueid and copy the UNIQUE_ID environment variable to a request header, e.g.
RequestHeader set Request-ID %{UNIQUE_ID}e
You can add it to your httpd logs w/ the same syntax in LogFormat
>
>
> Regards,
>
>
> Niranjan
>
>
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--
Eric Covener
covener@xxxxxxxxx
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