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MQSeries.net Forum IndexWebSphere Message Broker SupportIIB10: Mon Profile - what is xpath to get http input header?

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john.ormerod
PostPosted: Wed Dec 23, 2020 7:53 am Post subject: IIB10: Mon Profile - what is xpath to get http input header? Reply with quote

Apprentice

Joined: 14 Feb 2017
Posts: 43

Hello

I have added an http header to Postman to simulate a Global Txn Id coming from DataPower.
Code:
X-Global-Transaction-ID : 7c4b7c375fe313c400001d50


In my Mon Profile, for the HTTP input node 'TxnStart', I want this header to be the Global Txn Id. However, this xpath doesn't work:
Code:
<p:globalTransactionId p:queryText='$Root/HTTPInputHeader/X-Global-Transaction-ID' p:sourceOfId='query'/>


Unfortunately, in the Mon Event msgs, the Global Txn Id is empty.

What do I need to specify in the Mon Profile?

I've searched and searched for an example for an HTTP Input Header without success.

The Flow Exerciser shows it to be present
Code:
<HTTPInputHeader>
   <X-Original-HTTP-Command>POST http://localhost:7080/HTTPInputMessageFlow HTTP/1.1</X-Original-HTTP-Command>
   <X-Global-Transaction-Id>7c4b7c375fe313c400001d50</X-Global-Transaction-Id>


i've looked hard for typos and differing case as the cause, but, naturally, I can't see any.

Grateful for any words of wisdom.
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abhi_thri
PostPosted: Thu Dec 24, 2020 12:09 am Post subject: Reply with quote

Chevalier

Joined: 17 Jul 2017
Posts: 419
Location: UK

hi...must admit that i haven't touched xpaths in a while, just wondering whether the it is the hypens in
Code:
X-Global-Transaction-ID
that is causing the issue and whether it need to be escaped
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fjb_saper
PostPosted: Sat Dec 26, 2020 9:57 am Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20460
Location: LI,NY

abhi_thri wrote:
hi...must admit that i haven't touched xpaths in a while, just wondering whether the it is the hypens in
Code:
X-Global-Transaction-ID
that is causing the issue and whether it need to be escaped

And here I thought that HTTP / HTTPS did not support a global transaction...
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rekarm01
PostPosted: Sun Dec 27, 2020 11:27 am Post subject: Re: IIB10: Mon Profile - what is xpath to get http input hea Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 1400

john.ormerod wrote:
i've looked hard for typos and differing case as the cause, but, naturally, I can't see any.

So, is that an uppercase "...-ID"?

john.ormerod wrote:
Code:
X-Global-Transaction-ID : 7c4b7c375fe313c400001d50


Or is it a mixed case "...-Id"?

john.ormerod wrote:
Code:
<HTTPInputHeader>
   <X-Original-HTTP-Command>POST http://localhost:7080/HTTPInputMessageFlow HTTP/1.1</X-Original-HTTP-Command>
   <X-Global-Transaction-Id>7c4b7c375fe313c400001d50</X-Global-Transaction-Id>

If that is not the issue, then try adding a Trace node to display the parsed header, to compare with the desired XPath.

abhi_thri wrote:
just wondering whether the it is the hypens

The only constraint is that the name can't start with a hyphen.
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john.ormerod
PostPosted: Wed Jan 06, 2021 1:57 am Post subject: Reply with quote

Apprentice

Joined: 14 Feb 2017
Posts: 43

Thanks rekarm01

You have spotted what I didn't see: '-Id' (as copied from the Flow Exerciser data) instead of '-ID'. Now I know where to look. It's either my mistake in Postman or IIB has made an executive decision and changed '-ID' to '-Id'.

Let me offer a Happy New Year in addition to my thanks.

As I segued from WAH to HAH, I will resolved in a week's time when my 'holiday' segues back to WAH.

Best regards, John
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john.ormerod
PostPosted: Sun Jan 10, 2021 4:32 am Post subject: Reply with quote

Apprentice

Joined: 14 Feb 2017
Posts: 43

Resolved:

For a user-defined ('X-Xxx') incoming HTTP header, IIB changes the case of the letters after the final '-' to be: 'Uxxx' (i.e first letter is upper case, the rest are lower case.

For example, if the incoming header ends with '-xSPqR', it will be seen by the HTTP Input node as: '-Xspqr'.

Can anyone explain why IIB takes it upon itself to make this change?
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