HTTP / multipart / boundary review
multipart/form-data boundary review guide
Check the boundary, line ending, and filename metadata before sending. This guide compares synthetic cases without making a network request.
Multipart boundaries
The Content-Type boundary and body delimiters must agree so the receiver can split parts. Treat filename and filename* as distinct metadata.
| Case | Result | Key point |
|---|---|---|
| Choose a case to see the comparison. | ||
Why there is no upload
This page does not send files, forms, credentials, or analytics and does not persist anything.
A PASS for a synthetic case does not certify compatibility with a real browser, server, or multipart parser. Check the receiver contract separately.