Issues with the YAAK Tool When Debugging the File Upload API
BugImprovement
When using this tool to debug the upload API, I encountered a 400 Bad Request error. After a detailed comparison with a successful POST request made via Postman—where the parameters were identical—I found that the main difference lies in the request headers. Postman automatically handles information such as the boundary, whereas Yaak does not. It is highly likely that this is the cause of the issue.
Translated with DeepL.com (free version)
Windows2026.4.0
Can you check the request headers in Yaak (in the response pane)?
Yaak also computes a boundary at send time. It just doesn’t show in the request pane when setting it up.
postman