topic RE: API Issue "Could not verify the provided CSRF token because your session was not found" in Product Forum

API Issue "Could not verify the provided CSRF token because your session was not found"

Prabhakara_Kuma — Tue, 24 Jan 2023 03:22:00 GMT

Hi,

I'm having an issue with an API invocation that needs OAuth 2.0 (JWT Bearer Token) mechanism with CSRF token (refer below link for details). Able to invoke API through postman tool however, having difficulty in invoking the API via Blue prism. Have tried two options on Blue Prism 1. Configure Web API Services and invoke end point 2. Utility-HTTP -> HTTP Request. Able to generate token in 2nd option but unable to invoke API successfully using the token generated. It throws 403 Forbidden error "Could not verify the provided CSRF token because your session was not found"
The observation is that PostMan is using Bearer <Token> + cookie value. Below is the test script. Not sure how to achieve this in Blue Prism. Unable to use Fiddler as it is restricted in the organization.

var xsrfcookie = postman.getResponseCookie('XSRF-TOKEN');
postman.setEnvironmentVariable('xsrf-token',xsrfcookie.value);

CSRF Token setup: https://www.baeldung.com/postman-send-csrf-token

Appreciate your help

Thanks, Prabhakar

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Prabhakara Kumar Malireddi
Architect
Cognizant Technology Services
America/Chicago
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

GopalBhaire — Tue, 24 Jan 2023 05:31:00 GMT

Hi Prabhakara,

Are you not getting it as part of response on authentication? It sometimes is part of the headers on authentication.

Thanks.

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Gopal Bhaire
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

Prabhakara_Kuma — Tue, 24 Jan 2023 22:01:00 GMT

Hi Gopal,

Thanks for your help. Yes, i see similar to this: - " dtCookie=xxx-yyyy-dfdfdf-sdfsdf-dfedfdsfsdfdsfsdf; Path=/; Domain=xx.com,PF=ABCDEDD;Path=/;Secure;HttpOnly;SameSite=None" . Tried with value cookie value but didn't work. Am i missing something?

Appreciate your help.

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Prabhakara Kumar Malireddi
Architect
Cognizant Technology Services
America/Chicago
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

GopalBhaire — Wed, 25 Jan 2023 04:46:00 GMT

Hi Prabhakara,

I think the token is part of cookie. You can modify the code to get cookies from the response.

Make a duplicate of HTTP Request page and try the following code (untested) on line 66, you might have to add one more text output cookies

Using response As HttpWebResponse = request.GetResponse()
	  For Each cookie As Cookie In response.Cookies
			cookies += cookie.Name.ToString() + cookie.Value.ToString() + cookie.Path.ToString() + cookie.Domain.ToString()
	  Next

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Gopal Bhaire
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

ewilson — Wed, 25 Jan 2023 22:13:00 GMT

@Prabhakara_Kuma,

First question I always ask in a situation where someone's having problems using the HTTP VBO for token/apikey authentication is, have you downloaded the latest version of the HTTP VBO from the DX? If you're using the version that came with your Blue Prism installation you are not using the latest one.

The version available on the DX has a few new options including a flag to signify that a bearer token will be used.

Cheers,

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Eric Wilson
Director, Integrations and Enablement
Blue Prism Digital Exchange
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

Prabhakara_Kuma — Thu, 02 Feb 2023 20:58:00 GMT

Thanks Gopal for the response. Tried to extract cookie but it returns blank for some reason. Same is the case for authentication or API invocation (throws 403 error anyway). Kindly let me know if any other suggestions.

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Prabhakara Kumar Malireddi
Architect
Cognizant Technology Services
America/Chicago
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RE: API Issue "Could not verify the provided CSRF token because your session was not found"

Prabhakara_Kuma — Thu, 02 Feb 2023 21:06:00 GMT

Hi Eric, thank you for suggesting this. Tried with Utility Http 10.0 version and provided bearer token and bearer token flag. No difference. "The remote server returned an error: (403) Forbidden." Tried Http Request , Post actions and the behavior is same.

Need a way to extract the cookie to submit in the subsequent requests. Any other suggestions ?. Thank you.

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Prabhakara Kumar Malireddi
Architect
Cognizant Technology Services
America/Chicago
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