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HTTP Fetch Policy
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This document tries to document the platform's fetching policy for HTTP.
Request
General limitations
Methods:
- Uppercased (so e.g. geT becomes GET): CONNECT, DELETE, GET, HEAD, OPTIONS, POST, PUT, TRACE, and TRACK.
- Never work: CONNECT, TRACE, and TRACK (subset of the above).
Headers: Limitations as per setRequestHeader().
Body: No limitations
Additional general cross-origin (no preflight) limitations
Methods: Only GET, HEAD, and POST.
Headers: Only Accept, Accept-Language, Content-Language, and Content-Type. If Content-Type, value excluding parameters must be application/x-www-form-urlencoded, multipart/form-data, or text/plain.
EventSource cross-origin (no preflight) allowance(sp?)
Headers: Last-Event-ID
CSP cross-origin (no preflight) allowance(sp?)
Headers: Content-Type, with value application/json
Response
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