topic Re: API call when using HTTP-connector fails because invalid_token was used in oauth2 in Workato Pros Discussion Board

API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Thu, 05 Feb 2026 13:14:42 GMT

Hi, when reaching out to an application with the HTTP connector I often get an error for "invalid_token, the access token provided has expired". This seems to happen every time a new token is needed for a call. When repeating the job, the call goes just fine.

First call result:

Second call result:

Does anyone have an idea what the cause could be? Also I never encounter this problem using Postman.

To mee it seems like the token was used too quickly for the target application to be able to validate the token.
In the debug of the HTTP request I see no details of the actual headers/payload/response
What is the best-practice solution I could try?

I have not seen anything like a delay in the HTTP connector settings and it seems to extreme to make a custom connector.

The target application accepts the usual Oauth2 flow, with grant_type: client_credentials.
This results in a bearer token for all following calls.

I look forward to your inspiration, also: please let me know if this is not the right place for this question.

Kind regards,

Vincent

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

francbaviello — Thu, 05 Feb 2026 13:40:43 GMT

Hi @vbosma, the behavior appears to be due to an internal Workato race condition during automatic OAuth token refresh:

When Workato detects an expired token, it initiates the token renewal request;
However, the call to the protected endpoint is initiated before the new token is actually saved and applied to the Authorization header;
As a result, the first request is sent with an invalid (or absent) token and is rejected by the API;
The subsequent call works correctly because the token has been refreshed in the meantime.

This explains:

the error only on the first call,
the fact that the immediate retry succeeds,
the absence of the problem in Postman (which executes the OAuth flow strictly sequentially).

As a workaround, you can evaluat:

manual OAuth token management (explicitly separating the token request and API call);
or implementing an automatic retry in the event of a 401 / invalid_token error.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

shivakumara — Thu, 05 Feb 2026 14:26:51 GMT

Hi @vbosma ,

I have the following question:
How often do you run this recipe?

You can also try enabling the “Automatic retry” option (recommended) in your recipe.
This will help you to get the latest token in case failed get positive response.

Thanks and Regards,
Shivakumara K A

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Thu, 05 Feb 2026 15:06:58 GMT

Hi francbaviello,

Thank you for your quick reply and detailed explanation. The first automatic retry was my first idea too, but then I noticed that the invalid_token response still has a 200 OK status.

So now I put in an IF statement, and then put a WAIT block for 5 seconds, to retry again.. which also has an IF statement to alert if the response is the same.

Do you consider this a proper work-around? The recipe looks like this:

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Thu, 05 Feb 2026 15:10:04 GMT

Hi @shivakumara ,

Thank you for your quick reply.
This recipe is eventdriven, so not on a schedule.

Like in my response to francbaviello, the status response from the other client is 200 OK, even though the token is invalid.
Therefor I put in the IF statement (see screenshot in same response). So the automatic retry is no option.

If you have any other ideas I would like to hear them.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Thu, 05 Feb 2026 15:24:42 GMT

Hi @francbaviello , I just retried and noticed even this workaround is not proof.. there was still an invalid_token error:
The wait specified length of time is set to 5 seconds, but this does not seem to be enough either.
I might have to check your manual Oauth token management or hope you guys have another way.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

gary1 — Thu, 05 Feb 2026 18:15:57 GMT

Token expiration is silly, so I choose not to deal with it.

The 🚨 API Police 🚨 probably don't like this, but I always request a new token for every API call.

I split the process into two HTTP actions: one to get the token, then another to make the call with the token.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

francbaviello — Thu, 05 Feb 2026 20:05:14 GMT

Hi @vbosma, for the First workaround can you send the response/error of the http action?

How the second workaround, you can create two http invocation if possibile:

First invocation: you send http request at url to receive in the response the access token;
Second invocation: you send http request with authentication token.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

shivakumara — Fri, 06 Feb 2026 05:04:05 GMT

Hi @vbosma ,

In the retry mechanism, also inspect the error response body to identify token-expiration errors.

If the error is related to an expired access token, skip the retry. Instead, handle the error by first refreshing the token explicitly (preferably using a separate callable recipe or function dedicated to token management).

Once the token is refreshed, re-execute the same business logic within the error handling block, rather than relying on multiple retries.

This approach avoids unnecessary retries, reduces failed jobs, and results in more predictable behavior when handling token expiration in Workato.

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Fri, 06 Feb 2026 08:39:27 GMT

Hi @francbaviello you can see the error of the first call in my very first screenshot. It is a message that does not contain an actual status code that makes Workato give an error.

The status is 200 OK and the body contains the error. This is the reason there is no error from the HTTP action itself.

Like you opted: I made 2 calls now, 1 going for the /token endpoint, and the next using that token so there are no more invalid tokens.

Thank you for your inspiration/your help and thinking with me!

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Fri, 06 Feb 2026 08:47:05 GMT

@shivakumara This seems like another way to do the token management, I agree. Also thinking about the amount of consumed tasks. I think this might be the way after some time with a bit more experience (and excessive tasks-usage). Thank you!

Re: API call when using HTTP-connector fails because invalid_token was used in oauth2

vbosma — Fri, 06 Feb 2026 08:51:32 GMT

Yes, this is the way for now. Thank you for your reply.