Error loading schema from URL or GraphQL Endpoint

Describe the bug

When attempting to run the code generator with a schema variable that is a URL it fail with the following error: Failed to load schema from http://my-graphql-api.com/graphql: Request with GET/HEAD method cannot have body.

Stack Trace:

TypeError: Request with GET/HEAD method cannot have body.
    at new Request (graphql-code-generator-issue-sandbox-template\node_modules\undici\lib\fetch\request.js:437:13)
    at Agent.fetch (graphql-code-generator-issue-sandbox-template\node_modules\undici\lib\fetch\index.js:114:21)
    at fetch (graphql-code-generator-issue-sandbox-template\node_modules\undici\index.js:90:22)
    at fetch (graphql-code-generator-issue-sandbox-template\node_modules\cross-undici-fetch\dist\create-node-ponyfill.js:130:16)
    at fetch (graphql-code-generator-issue-sandbox-template\node_modules\cross-undici-fetch\dist\create-node-ponyfill.js:125:18)
    at defaultAsyncFetch (graphql-code-generator-issue-sandbox-template\node_modules\@graphql-tools\url-loader\cjs\defaultAsyncFetch.js:6:43)
    at graphql-code-generator-issue-sandbox-template\node_modules\@graphql-tools\url-loader\cjs\index.js:212:36
    at new ValueOrPromise (graphql-code-generator-issue-sandbox-template\node_modules\value-or-promise\build\main\ValueOrPromise.js:14:21)
    at executor (graphql-code-generator-issue-sandbox-template\node_modules\@graphql-tools\url-loader\cjs\index.js:186:20)
    at graphql-code-generator-issue-sandbox-template\node_modules\@graphql-tools\url-loader\cjs\index.js:504:35

Your Example Website or App

https://github.com/edramos-97/graphql-code-generator-issue-sandbox-template

Steps to Reproduce the Bug or Issue

Execute npm install followed by npm run generate See error “Failed to load schema from http://my-graphql-api.com/graphql: Request with GET/HEAD method cannot have body.”

Expected behavior

As a User, I expected the code generator to support loading the schema from a URL/GraphQL endpoint but I’m seeing a fatal error that prevent the schema from being loaded

Screenshots or Videos

No response

Platform

• OS: Windows 10
• PowerShell: 7.2.5
• NodeJS: 16.13.2
• npm: 8.5.5

npm tree as of reporting:

graphql-codegen-issue-template@1.0.0 ├── @graphql-codegen/add@3.1.1 ├── @graphql-codegen/cli@2.6.4 ├── @graphql-codegen/typescript-operations@2.4.1 ├── @graphql-codegen/typescript@2.5.0 └── graphql@16.5.0

Codegen Config File

schema: http://my-graphql-api.com/graphql documents: ‘./src/**/*.tsx’ generates: ./graphql/generated.ts: plugins: - typescript - typescript-operations - typescript-react-query config: fetcher: fetch

# Copied from the guide https://www.graphql-code-generator.com/docs/guides/react

Additional context

No response

[tylermenezes]

That worked for me too!

@franzwilhelm if you’re using yarn, try adding this to your package.json:

  "resolutions": {
    "undici": "5.5.1"
  }

[adam-nielsen]

I just found the problem. It’s in the undici package. You can fix it temporarily by running:

npm install undici@5.5.1
npm remove undici

This has the effect of reverting the dependent version from 5.6.0 (broken) to 5.5.1 (previous release, working), without leaving it in your package.json.

5.5.1 is the previous version (released 18 days ago), it only broke in the version following this (5.6.0) released 11 hours ago.

After doing this I was able to run the code generator again successfully.