Allow plugins to set response status code

When there is an issue that means an entire request has failed, which would normally result in an a 200 status code, it would be useful to be able to return something other than a 200.

Currently, if we want to change the response via a plugin (within willSendResponse for example), the following will change it to a 200, providing the original code was an error code: requestContext.response.http.status = 200; However, if the response is a 200, the opposite will not change it to an error code: requestContext.response.http.status = 500;

[qsona]

👍 I’m a user of apollo-server and I really want this feature. We basically monitor the rate of http status code and use it as service level indicator. It’s a difficult problem that how to treat partial errors (some fields are correctly calculated and some are not), but as a first step we’d like to treat partial errors as 5xx error.

Seems related to: https://github.com/apollographql/apollo-server/issues/473

[burtontanner]

@awinograd Thanks! That worked for me. Just to add some more detail for someone else trying to do this. Create a plugin like so

  import {ApolloServerPlugin} from "apollo-server-plugin-base/src/index";
  
  const statusCodePlugin:ApolloServerPlugin  = {
    async requestDidStart(requestContext) {
      return {
        async willSendResponse(requestContext) {
          const errors = (requestContext?.response?.errors || []) as any[];
          for(let error of errors){
            if(error?.code === 'unauthorized'){
              requestContext.response.http.status = 401;
            }
            if(error?.code === 'access'){
              requestContext.response.http.status = 403;
            }
          }
        }
      }
    },
  };
  
  export default statusCodePlugin;