Glossary term
What is magic bytes? Meaning for developers
The first bytes of a file show its real type. Check them. Do not trust the file extension or the Content-Type.
Learn it properly · Practical Design ProblemsLesson 4: Design File Upload (Including Large Files)Multipart uploads vs presigned URLs, chunked and resumable uploads, a progress bar, checking files, and why the API server should not pass gigabytes through itself.