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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /fetch/api/response/response-init-contenttype.any.html - WPT Dashboard Interop Dashboard
- /fetch/api/response/response-init-contenttype.any.worker.html - WPT Dashboard Interop Dashboard
test(() => {
const response = new Response();
assert_equals(response.headers.get("Content-Type"), null);
}, "Default Content-Type for Response with empty body");
test(() => {
const blob = new Blob([]);
const response = new Response(blob);
assert_equals(response.headers.get("Content-Type"), null);
}, "Default Content-Type for Response with Blob body (no type set)");
test(() => {
const blob = new Blob([], { type: "" });
const response = new Response(blob);
assert_equals(response.headers.get("Content-Type"), null);
}, "Default Content-Type for Response with Blob body (empty type)");
test(() => {
const blob = new Blob([], { type: "a/b; c=d" });
const response = new Response(blob);
assert_equals(response.headers.get("Content-Type"), "a/b; c=d");
}, "Default Content-Type for Response with Blob body (set type)");
test(() => {
const buffer = new Uint8Array();
const response = new Response(buffer);
assert_equals(response.headers.get("Content-Type"), null);
}, "Default Content-Type for Response with buffer source body");
promise_test(async () => {
const formData = new FormData();
formData.append("a", "b");
const response = new Response(formData);
const boundary = (await response.text()).split("\r\n")[0].slice(2);
assert_equals(
response.headers.get("Content-Type"),
`multipart/form-data; boundary=${boundary}`,
);
}, "Default Content-Type for Response with FormData body");
test(() => {
const usp = new URLSearchParams();
const response = new Response(usp);
assert_equals(
response.headers.get("Content-Type"),
"application/x-www-form-urlencoded;charset=UTF-8",
);
}, "Default Content-Type for Response with URLSearchParams body");
test(() => {
const response = new Response("");
assert_equals(
response.headers.get("Content-Type"),
"text/plain;charset=UTF-8",
);
}, "Default Content-Type for Response with string body");
test(() => {
const stream = new ReadableStream();
const response = new Response(stream);
assert_equals(response.headers.get("Content-Type"), null);
}, "Default Content-Type for Response with ReadableStream body");
// -----------------------------------------------------------------------------
const OVERRIDE_MIME = "test/only; mime=type";
function responseWithOverrideMime(body) {
return new Response(
body,
{ headers: { "Content-Type": OVERRIDE_MIME } },
);
}
test(() => {
const response = responseWithOverrideMime(undefined);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with empty body");
test(() => {
const blob = new Blob([]);
const response = responseWithOverrideMime(blob);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with Blob body (no type set)");
test(() => {
const blob = new Blob([], { type: "" });
const response = responseWithOverrideMime(blob);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with Blob body (empty type)");
test(() => {
const blob = new Blob([], { type: "a/b; c=d" });
const response = responseWithOverrideMime(blob);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with Blob body (set type)");
test(() => {
const buffer = new Uint8Array();
const response = responseWithOverrideMime(buffer);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with buffer source body");
test(() => {
const formData = new FormData();
const response = responseWithOverrideMime(formData);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with FormData body");
test(() => {
const usp = new URLSearchParams();
const response = responseWithOverrideMime(usp);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with URLSearchParams body");
test(() => {
const response = responseWithOverrideMime("");
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with string body");
test(() => {
const stream = new ReadableStream();
const response = responseWithOverrideMime(stream);
assert_equals(response.headers.get("Content-Type"), OVERRIDE_MIME);
}, "Can override Content-Type for Response with ReadableStream body");