AWS API gateway 403 missing authentication token error messages resolved with Bobcares by your side. 

At Bobcares, we offer solutions for every query, big and small, as a part of our Server Management Service.

Let’s take a look at how our Support Team recently helped a customer resolve their AWS API gateway 403 Missing authentication Token error messages.

What is AWS API gateway 403 missing authentication token error?

Have you been having trouble with 403 “Missing Authentication Token” errors from an API Gateway REST API endpoint? Fortunately, our Support Engineers are here to help out.

In fact, these errors pop up due to one of these reasons:

• The API request is made to a non-existent method or resource.
• The API request is not signed when the API method’s IAM authentication is on.

Our Support Team is here with three different strategies to get rid of the missing authentication token error.

Check if there is a method & resource configured in the API Gateway resource path

First, we will set verify if there is a method and resource configured in the API Gateway resource path, If not, we will set up a method and deploy the API to enable the changes to take effect.

Furthermore, if the method request is sent to the root resource, we have to check if there is a method configured under the root resource.

Check if you are sending the right HTTP method request to the REST API endpoint

According to our Support Techs, we can test a REST API endpoint from the web browser. In fact, this automatically sends a GET HTTP request.

If we are testing a POST HTTP method request, we have to use a different HTTP client like curl or Postman.

For instance:

$  curl -X POST  <API URL> -d <request body>

It is also a good idea to verify that the API request is signed in case the API method has IAM authentication turned on.

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Conclusion

In brief, the skilled Support Engineers at Bobcares demonstrated how to deal with Missing authentication Token error messages.