Node 22.3.0 regression: undici sends invalid origin header in some cases #3334
Closed
Description
Bug Description
Since v6.16.1, undici sends the origin header as origin: https://origin.example.com, undefined in some cases.
This reproducibly happens when sending a POST request, with the origin header explicitly specified in headers and redirect: "error".
Reproducible By
import { fetch } from 'undici';
async function repro() {
let api_url = "http://localhost:8080";
let response = await fetch(api_url, {
"headers": {
"origin": "https://origin.example.com"
},
"body": "",
"method": "POST",
"redirect": "error"
});
}
await repro();
Expected Behavior
I expected the origin header to be sent as origin: https://origin.example.com.
Logs & Screenshots
complete request sent with undici v6.16.1 and above:
POST / HTTP/1.1
host: localhost:8080
connection: keep-alive
origin: https://origin.example.com, undefined
content-type: text/plain;charset=UTF-8
accept: */*
accept-language: *
sec-fetch-mode: cors
user-agent: undici
accept-encoding: gzip, deflate
content-length: 0
complete request sent with undici v6.16.0:
POST / HTTP/1.1
host: localhost:8080
connection: keep-alive
origin: https://origin.example.com
content-type: text/plain;charset=UTF-8
accept: */*
accept-language: *
sec-fetch-mode: cors
user-agent: undici
accept-encoding: gzip, deflate
content-length: 0
Environment
Arch Linux, Node.js v22.3.0