topic Re: Unable to Instrument JavaScript with automatic tag injection in Real User Monitoring

Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Tue, 14 Dec 2021 13:00:07 GMT

Dear All,

Unable to instrument one of the Public Website through automatic tag injection. I found the below message in the developer's mode.

The key "" is not recognized and ignored.

[Deprecation] Setting cookies via `<meta http-equiv='Set-Cookie' ...>` no longer works, as of M65. Consider switching to `document.cookie = ...`, or to `Set-Cookie` HTTP headers instead. See https://www.chromestatus.com/feature/6170540112871424 for more details.

Blocked setting the `domain=XXXXXXXXXX.com.com; path=/; httponly;` cookie from a `<meta>` tag.

In the documentation, I found the following information.

RUM correlation requires that the dtCookie and dtPC cookies be on web requests in order to link them to user actions. However, because dtCookie is part of the beacon and because the JavaScript library sets and modifies these cookies, these cookies don't support the HTTPOnly flag. See cookies for complete details.

Is there any relevance between the error and the above information?

What is the solution in case they are relevant?

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Wed, 03 Jul 2019 07:05:43 GMT

Does your application work on HTTPS or HTTP? It seems that there is problem with unsecure applications.

Sebastian

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 03 Jul 2019 07:19:09 GMT

Hello @sebastian k.

It is HTTPS and I checked with the use the secure cookie attribute for cookie and without it.

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Wed, 03 Jul 2019 07:48:52 GMT

Ok and without rum injected there is no issue, yes? I've never seend setting cookies via metatag in dynatrace. This is something that is strange for me.

Sebastian

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 03 Jul 2019 09:30:52 GMT

Hello @sebastian k.

I am getting the below message on all the pages/tabs even though web requests are available but no UEM.

<!DOCTYPE html>

<html>

Security - Online Banking Safety Features

</title>

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Wed, 03 Jul 2019 09:57:34 GMT

This part:

"<meta http-equiv="set-cookie" content="domain=XXXXX.com.com; path=/; httponly;" />"

is not related to RUM, but this may be issue. I think that, script is doing something with cookies and in such case has problem? This may be case for support.

Sebastian

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 03 Jul 2019 10:42:34 GMT

Hello @sebastian k.

Thank you for all your time to look into the said situation and opinion about the support case.

I already raised a flag with the network and security team and also going to engage the support.

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Tue, 09 Jul 2019 08:58:45 GMT

Hello @sebastian k.

We did manual instrumentation and able to load the JavaScript in each page of the website but even though there is no UEM data.

The result of https://XXXXXXXX.com/system/js/rb_5e8dab8f?type=check is HTTP Error 404.0 - Not Found.

Any hint in this situation?

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Tue, 09 Jul 2019 16:25:29 GMT

Why are you asking rum Beakon url with aspx suffix?

Re: Unable to Instrument JavaScript with automatic tag injection

Dant3 — Wed, 10 Jul 2019 04:05:26 GMT

You should edit the url hotlink or remove it, since is redirecting to the real uat page. Also, as @sebastian k. said the manual injection is kinda weird. It should end with a .js for the extension of the file. And the rb_5e8dab8f of the callback beacon shouldnt be there.

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 10 Jul 2019 05:49:20 GMT

Hello @sebastian k. and @Dante P.

Thank you both of you for your responses.

As you can see the manual injected script is loading without any issue.

But when I test that the monitor signal passes through my infrastructure (as we are not receiving any UEM data) with the following method then I am getting HTTP Error 404.0 - Not Found and also Requested URL is automatically changing to the .aspx

https://xxxxxxxx.com/system/js/rb_5e8dab8f?type=check

Also, I can see the below message in the developer's mode for each request/page.

What should be the next step in this situation to make it work?

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Wed, 10 Jul 2019 06:24:27 GMT

As I understand, webserver below this application is instrumented by oneagent? If yes I think you chould play with beacon url configuration in application settings, because such origin on js path may be blocked by webserver.

https://xxxxxxxx.com/system/rb_5e8dab8f?type=check

In general, this should be default path.

Sebastian

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 10 Jul 2019 06:29:54 GMT

Hello @sebastian k.

Exactly. I am doing the same to have beacon information.

What else can be the issue?

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

Dant3 — Wed, 10 Jul 2019 09:46:14 GMT

I had a similar problem, that when sending the callback (post) didn't go since the app server / security will not allow post, since the app itself didn't need it, obvisuly that was a 403 and not a 404, but to make it short, since this is a managed enviroment? do you have a cluster activegate?

What I did was change the beaconurl at the app settings, so it would not back to the app server, but to the cluster Activegate.

Obviusly there is some rule at the appserver that adds the aspx extension.

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Wed, 10 Jul 2019 10:09:59 GMT

Hello @Dante P.

This is a Pre-Production environment, hence we have only the Environment ActiveGates in different network zones.

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Wed, 10 Jul 2019 11:01:36 GMT

@Babar Q. you are not doing the same. You've pasted url with /js/ in path 🙂

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Thu, 11 Jul 2019 06:17:16 GMT

Hello @sebastian k.

Believe me, I removed the /js/ and even more than this during exercise. I will share the findings here.

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Thu, 11 Jul 2019 06:35:04 GMT

For me 404 means that web server is blocking your beacon. I've had such scenarios. Check on what path is your webserver receiving xhr's and try to modify beacon url to make it the same for agent.

Sebastian

Re: Unable to Instrument JavaScript with automatic tag injection

Babar_Qayyum — Thu, 11 Jul 2019 14:19:00 GMT

Hello @sebastian k. and @Dante P.

I wanted to share the drop seen of this issue. There was a blunder from our side which is overlooked while installing the OneAgent.

The same server was instrumented by AppMon agent in the past and without uninstalling the AppMon Web Server Agent we installed the OneAgent on top of it which simply stopped the AppMon Web Agent Service but the Native Module information was still intact.

In short, after removal of AppMon and restarting the server beacon data started receiving as expected.

Regards,

Babar

Re: Unable to Instrument JavaScript with automatic tag injection

skrystosik — Thu, 11 Jul 2019 16:29:03 GMT

Cool 😉 nice to hear