Q: How to kill the default request mapping templates from API Gateway?

Serverless Framework
,
1

Is there any way to delete the default request mapping templates that are generated by serverless by default in API Gateway? My lambda function wants the passthrough json from an application/json-type request, not the re-mapped version.

Alternatively, is there a way to create a mapping that is similar to a passthrough?

Either solution would work for me.

My lambda functions work great if I go in manually after a ‘serverless deploy’ and delete the request mapping templates, but I can’t for the life of me figure out a way to stop those templates from being created in the first place.

2

Hey @scumola, what integration type are you using for your function?

If possible, could you post the whole functions block for your serverless.yml ? I’ll experiment and see if I can figure out a workaround :slight_smile:

3

Thanks @alexdebrie1

functions:
  investor_create:
    handler: investor/create/index.handler
    package:
      include:
        - investor/create/**
    events:
      - http:
          path: investor
          method: post
          cors: true
          integration: lambda
4

It’s these that I want to get rid of:

API_Gateway
API_Gateway1265×1138 239 KB

5

@scumola I dug around on this and have an update. There’s no way to not send up any templates at all, as the Framework automatically sends up application/json and application-x-www-form-urlencoded templates. See here.

You can overwrite those templates, so it looks like you’d have to go with your second option, which is to use a mapping that’s similar to a passthrough. I can’t find docs on what that looks like – can you send me an event after a passthrough?

7

This fixes it.

diff --git a/lib/plugins/aws/package/compile/events/apiGateway/lib/method/integration.js b/lib/plugins/aws/package/compile/events/apiGateway/lib/method/integration.js
index d9e76d3fde..e3b327df57 100644
--- a/lib/plugins/aws/package/compile/events/apiGateway/lib/method/integration.js
+++ b/lib/plugins/aws/package/compile/events/apiGateway/lib/method/integration.js
@@ -171,12 +171,12 @@ module.exports = {
     const integrationRequestTemplates = {};
 
     // Only set defaults for AWS (lambda) integration
-    if (useDefaults) {
-      _.assign(integrationRequestTemplates, {
-        'application/json': this.DEFAULT_JSON_REQUEST_TEMPLATE,
-        'application/x-www-form-urlencoded': this.DEFAULT_FORM_URL_ENCODED_REQUEST_TEMPLATE,
-      });
-    }
+//    if (useDefaults) {
+//      _.assign(integrationRequestTemplates, {
+//        'application/json': this.DEFAULT_JSON_REQUEST_TEMPLATE,
+//        'application/x-www-form-urlencoded': this.DEFAULT_FORM_URL_ENCODED_REQUEST_TEMPLATE,
+//      });
+//    }
 
     // set custom request templates if provided
     if (http.request && typeof http.request.template === 'object') {
8

i am facing the same issue…but i cannot update the serverless stack.

9

samiya03 I faced the same issue. I opted for overwriting the mapping template in the serverless file

request: 
            template:
              application/json: '$input.json("$")'

This allows whatever you pass in to be passed through while the application/json mapping template is used.

image
image1030×603 15.8 KB

10

The following lines will disable default mappings:

       request: 
            template:
               application/json: null
               application/x-www-form-urlencoded: null

Related GitHub URL Issue 7008 default request templates by jormaechea · Pull Request #8159 · serverless/serverless · GitHub