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Specify range of valid HTTP response codes #849
Description
What is the domain of wasi:http/response#set-status-code ?
RFC 9110 specifies the set of HTTP status codes, divided in 5 blocks (100-199, 200-299, 300-399, 400-499, 500-599), and specifies that new status codes should fall in those blocks.
Proposal: codes should be in the range 100-599.
FWIW, Rust's http crate allows 100-999, while "discouraging" codes 600 or above: https://github.com/hyperium/http/blob/master/src/status.rs#L73.
Activity
wasi:http: Restrict valid set of HTTP response codes to 100-599
wasi:http: Restrict valid set of HTTP response codes to 100-599
wasi:http: Restrict valid set of HTTP response codes to 100-599 (#12149)
wasi:http: Restrict valid set of HTTP response codes to 100-599 (#12149)
wasi:http: Restrict valid set of HTTP response codes to 100-599 (#12149)
igrep commentedon Dec 10, 2025
Doesn't it need to accept unofficially used status codes (such as 999)?
wingo commentedon Dec 11, 2025
In the abstract it is better to use a field for that purpose, as fields are the extensible part of a response. Obviously if the use of e.g. 999 is widely-deployed we probably need to support it.
Interestingly I just read WhatWG fetch's specification, which allows 0..=999: https://fetch.spec.whatwg.org/#concept-status
I still think 100..-=599 is the right choice though if we manage to make it stick.
yoshuawuyts commentedon Dec 16, 2025
cc/ @WebAssembly/wasi-http-champions