1652717 - HTTPSSVC records that advertise HTTP3 will need HappyEyeballing

Status: RESOLVED FIXED

(Core :: Networking: HTTP, task, P2)

Description

[Dragana Damjanovic [:dragana]]

HTTP3 uses UDP as the underlying protocol which may not work on all networks paths.

When a HTTP3 support is advertise using AltSvc header/frame, Firefox tries to connect to the HTTP3 server to verify that network path supports HTTP3 before using HTTP3 for actual requests. In case a user changes the network Firefox will not verify the network path again but it will use Happy-eyeballing to make fallback faster (bug 1648558). It will need a similar mechanism in thee case a support for HTTP3 was advertise by HTTPSSVC.

Approach:
A nsHttpTransaction starts a connection to HTTP3 server (described in bug 1652677 Description step iii and iv). If the connection is not ready after 50ms the transaction should start another connection that does not use HTTP3 if such a SvcDomainName with echconfig and IPs addresses is available. If such a SvcDomainName is not available the transaction starts connection when it becomes available.

Comment 1

[Kershaw Chang [:kershaw]]

Attachment: Bug 1652717 - P1: Make sure we can connect to Http3 server according to HTTPS RR

Comment 2

[Kershaw Chang [:kershaw]]

Attachment: Bug 1652717 - P2: Implement fast fallback when H3 is used

Depends on D90997

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/018c0eebe944
P1: Make sure we can connect to Http3 server according to HTTPS RR r=necko-reviewers,valentin,dragana
https://hg.mozilla.org/integration/autoland/rev/ab09fd84e0e4
P2: Implement fast fallback when H3 is used r=necko-reviewers,valentin,dragana

Comment 4

[Dorel Luca [:dluca]]

Backed out 5 changesets (bug 1652717, bug 1665878, bug 1666620, bug 1652713) for XPCshell failures in components/migration/tests/unit/xpcshell.ini. CLOSED TREE

Log:
https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=317794277&repo=autoland&lineNumber=3802

Push with failures:
https://treeherder.mozilla.org/#/jobs?repo=autoland&group_state=expanded&revision=6322b86e1df42a2d468a134d6580b4a5db746a9f&selectedTaskRun=SQF6HSGCTWOZovkxOvQIrg.0

Backout:
https://hg.mozilla.org/integration/autoland/rev/04e0cdc282c235224d89ec00908c6af2e7341032

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7b36c882d33b
P1: Make sure we can connect to Http3 server according to HTTPS RR r=necko-reviewers,valentin,dragana
https://hg.mozilla.org/integration/autoland/rev/1fc2eee62b5a
P2: Implement fast fallback when H3 is used r=necko-reviewers,valentin,dragana

Comment 6

[Andreea Pavel [:apavel]]

https://hg.mozilla.org/mozilla-central/rev/7b36c882d33b
https://hg.mozilla.org/mozilla-central/rev/1fc2eee62b5a