response-invalid-utf8.html

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This WPT test may be referenced by the following Test IDs:
- /xhr/response-invalid-utf8.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>XMLHttpRequest: responseType json with invalid UTF-8</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

"use strict";

// Test that XHR handles invalid UTF-8 sequences in JSON responses gracefully

// The server returns JSON containing an invalid UTF-8 byte (0xFF)

async_test(t => {

  const xhr = new XMLHttpRequest();

  xhr.open("GET", "resources/invalid-utf8.py");

  xhr.responseType = "json";

  xhr.onload = t.step_func_done(() => {

    assert_equals(xhr.status, 200, "Status should be 200");

    assert_not_equals(xhr.response, null, "Response should not be null");

    // The invalid byte should be replaced with U+FFFD

    assert_equals(xhr.response.key, "\uFFFD", "Invalid UTF-8 byte should become replacement character");

});

  xhr.onerror = t.unreached_func("XHR should not error");

  xhr.send();

}, "JSON response with invalid UTF-8 should parse with replacement characters");

</script>