Intercept and reject requests based on body content

[ortonomy]

I want to be able to intercept and reject a request through the proxy by examining body content.

For example, my request coming through is a grapql query or mutation in body of POST

mutation {
  registerUser ( ... ) {
    ...
  }
}

and I want to be able to examine the content body for registerUser (or something else) and reject with a 403 - Forbidden.

I feel it's similar, but the opposite to here: #97

So I'd like to use onProxyReq, but I dont' know how to read the body and then make an action using req / res. Anyone can help?

[stevenkissack]

Did you ever resolve this? I am trying to do the exact same. I also want to modify the graphql query in certain cases, and reject all mutations

[nsrCodes]

You can do this with Requestly by creating a Modify Response Rule withthe Request Payload filter. Link to article - https://requestly.io/blog/mocking-graphql-api-response/

[chimurai]

You might want to try using a library like nock.
It has tons of options to control the response.

The following example will just respond with 403 on every graphql request.

var scope = nock('http://my.domain.com')
  .intercept('/graphql', 'POST')
  .reply(403);

Check their documentation for more fine grained control.

Please let us know if you have any succes with nock.