Request Batching

Batching is the process of taking a group of requests, combining them into one, and making a single request with the same data that all of the other queries would have made. This is a way to reduce the number of requests that your application makes to the server.

The Batching functionality is described via the Batching RFC.

Enable Batching

Batching is disabled by default, but you can enable it by setting the batching option to true:

import { defineConfig } from '@graphql-mesh/serve-cli'
 
export const serveConfig = defineConfig({
  batching: true
})

curl -X POST -H 'Content-Type: application/json' http://localhost:4000/graphql \
  -d '[{"query": "{ hee: __typename }"}, {"query": "{ ho: __typename }"}]'

Limit the amount of Batched Requests

By default up to 10 GraphQL requests are allowed within a single HTTP request. If this amount is exceeded an error will be raised. You can customize this option by passing an object to the batching configuration option:

import { defineConfig } from '@graphql-mesh/serve-cli'
 
export const serveConfig = defineConfig({
  batching: {
    limit: 2
  }
})

curl -X POST -H 'Content-Type: application/json' -i http://localhost:4000/graphql \
  -d '[{"query": "{ hee: __typename }"}, {"query": "{ ho: __typename }"}, {"query": "{ holla: __typename }"}]'

When exceeding the batching limit the HTTP status code will be 413 (Payload Too Large).

{
  "errors": [{ "message": "Batching is limited to 2 operations per request." }]
}