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[HTML5] Disable body_size in fetch.

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We were using `Content-Length` from the server when `Content-Encoding`
was not set (i.e. response was not compressed).

Sadly, in CORS requests accessing headers is restricted, and while
`Content-Length` is enabled by default, `Content-Encoding` is not.

This results in the impossibility of knowing if the content was
compressed, unless the server explicitly enabled the encoding header
via `Access-Control-Expose-Headers`.

To keep maximum compatibility we must disable `body_size` completely.

(cherry picked from commit 737ed0f66e)
This commit is contained in:
Fabio Alessandrelli 2021-04-03 14:51:54 +02:00 • committed by Rémi Verschelde
parent 1cd13d22c2
commit f90b24a805
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GPG key ID: C3336907360768E1
2 changed files with 1 additions and 29 deletions
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17
platform/javascript/js/engine/preloader.js
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@ -1,22 +1,5 @@
const Preloader = /** @constructor */ function () { // eslint-disable-line no-unused-vars
function getTrackedResponse(response, load_status) {
let clen = 0;
let compressed = false;
response.headers.forEach(function (value, header) {
const h = header.toLowerCase().trim();
// We can't accurately compute compressed stream length.
if (h === 'content-encoding') {
compressed = true;
} else if (h === 'content-length') {
const length = parseInt(value, 10);
if (!Number.isNaN(length) && length > 0) {
clen = length;
}
}
});
if (!compressed && clen) {
load_status.total = clen;
}
function onloadprogress(reader, controller) {
return reader.read().then(function (result) {
if (load_status.done) {