Bug 1763281 allow one byte 206 Partial Content responses r=media-playback-reviewers,padenot

These were disallowed on initial implementation.
https://hg.mozilla.org/mozilla-central/rev/6df63191884b8631984d92bef4b937ab084042cd#l1.166

https://httpwg.org/specs/rfc7233.html#header.content-range
"A Content-Range field value is invalid if it contains a byte-range-resp that
has a last-byte-pos value less than its first-byte-pos value".

The aRangeEnd < aRangeTotal test correctly understands that aRangeEnd is an
inclusive index.

[range responses from multiple origins (cross-origin first)] fails because
Firefox reuses the media resource loaded in [range responses from single
origin (same-origin)] for subsequent resources with the same URL, without any
re-fetch (bug 1129121).

Depends on D143119

Differential Revision: https://phabricator.services.mozilla.com/D143120

netwerk/protocol/http/OpaqueResponseUtils.cpp

@@ -132,7 +132,7 @@ ParseContentRangeHeaderString(const nsAutoCString& aRangeStr) {
   if (NS_FAILED(rv)) {
     return Err(rv);
   }
-  if (rangeStart >= rangeEnd) {
+  if (rangeStart > rangeEnd) {
     return Err(NS_ERROR_ILLEGAL_VALUE);
   }
 

testing/web-platform/meta/service-workers/service-worker/fetch-canvas-tainting-video-with-range-request.https.html.ini

@@ -1,5 +1,5 @@
 [fetch-canvas-tainting-video-with-range-request.https.html]
-  [range responses from single origin (same-origin)]
+  [range responses from multiple origins (cross-origin first)]
     expected: FAIL
 
   [range responses from single origin with both opaque and non-opaque responses]