When the HTTP request body is in JSON format, the request may fail if there are line breaks or unescaped double quotes.

[litterGuy]

Summary

This change addresses an issue where HTTP requests with a JSON body fail due to the presence of line breaks or unescaped double quotes. The fix ensures that the JSON body is properly formatted, avoiding these issues.

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

Please link an existing issue or open a new issue in the description.