Description

When using http post or http patch with --content-type set to a JSON-variant type (e.g. application/json-patch+json), Nushell ignores the flag and always sends Content-Type: application/json; charset=utf-8 instead.

Steps to Reproduce

Start a local echo server (e.g. python3 -m http.server) or use any endpoint that reflects headers, then run:

import http.server, json

class Handler(http.server.BaseHTTPRequestHandler):
    def handle_request(self):
        length = int(self.headers.get("Content-Length", 0))
        body = self.rfile.read(length).decode()
        print(f"\n--- {self.command} {self.path}")
        print(f"Content-Type: {self.headers.get('Content-Type')}")
        print(f"Authorization: {self.headers.get('Authorization', '')[:20]}...")
        print(f"Body: {body}")
        self.send_response(200)
        self.send_header("Content-Type", "application/json")
        self.end_headers()
        self.wfile.write(b'{"id": 99999, "fields": {}}')

    def do_POST(self): self.handle_request()
    def do_PATCH(self): self.handle_request()
    def do_GET(self): self.handle_request()
    def log_message(self, *a): pass

let body = [{op: "add", path: "/foo", value: "bar"}]
http post "http://localhost:8000/test" --content-type "application/json-patch+json" ($body | to json)

Observe the actual Content-Type header received by the server.

Expected Behavior

The request is sent with Content-Type: application/json-patch+json as specified.

Actual Behavior

The request is sent with Content-Type: application/json; charset=utf-8, overriding the user-specified value.

This affects any API that requires a JSON-variant content type distinct from application/json, such as:

• application/json-patch+json (RFC 6902 — JSON Patch)
• application/merge-patch+json (RFC 7396)

Workaround

Embed the Content-Type header directly in the --headers list instead of using --content-type:

let headers = [Authorization "Bearer ..." "Content-Type" "application/json-patch+json"]
http post $url --headers $headers ($body | to json)

Environment

Nushell version: 0.110.0
OS: Linux (WSL2)