When the SW fetches URLs listed in a manifest with hashes, it checks
the content hash against the manifest to make sure it has the correct
version of the URL. In the event of a mismatch, the SW is supposed to
consider the manifest invalid, and avoid using it. There are 3 cases
to consider by which this can happen.
Case 1: during the initial SW installation, a manifest is activated
without waiting for every URL to be fully loaded. In the background,
every prefetch URL listed by the manifest is requested and cached.
One such prefetch request could fail the hash test, and cause the
manifest to be treated as invalid. In such a case, the SW should
enter a state of EXISTING_CLIENTS_ONLY, as the latest manifest is
invalid.
This case works today.
Case 2: during the initial SW installation, as in Case 1, a manifest
is activated without waiting for each URL to fully load. However,
it's possible that the application could request a URL with a bad
hash before background initialization tries to load that URL. This
happens if, for example, the application has a broken index.html.
In this case, the SW should enter a state of EXISTING_CLIENTS_ONLY,
and serve the request from the network instead.
What happens today is that the internal error escapes the SW and
is returned as a rejected Promise to respondWith(), causing a
browser-level error that the site cannot be loaded, breaking the
site.
This change allows the SW to detect the error and enter the correct
state, falling back on the network if needed.
Case 3: during checkForUpdate(), the SW will try to fully cache the
new update before making it the latest version. Failure here is
complicated - if the page fails to load due to transient network
conditions (timeouts, 500s, etc), then it makes sense to continue
serving the existing cached version, and attempt to activate the
update on the next cycle.
If the page fails due to non-transient conditions though (400 error,
hash mismatch, etc), then the SW should consider the updated
manifest invalid, and enter a state of EXISTING_CLIENTS_ONLY.
Currently, all errors are treated as transient.
This change causes the SW to treat all errors during updates as
non-transient, which can cause the SW to unnecessarily enter a
safe mode. A future change can allow the SW to remain in normal mode
if the error is provably transient.
PR Close#21288
This causes a 3.4kb size regressions for polyfills.js. :-(
I filed an issue for this: https://github.com/angular/zone.js/issues/989
-rw-r--r-- 1 iminar eng 73998 Jan 5 17:51 dist/0.5fb611ef423970fd3ba1.chunk.js
-rw-r--r-- 1 iminar eng 14880 Jan 5 17:51 dist/4.c719ac5645940382cdce.chunk.js
-rw-r--r-- 1 iminar eng 1558 Jan 5 17:51 dist/inline.797233300016416206fc.bundle.js
-rw-r--r-- 1 iminar eng 457592 Jan 5 17:51 dist/main.5870135237d5187f1ab6.bundle.js
-rw-r--r-- 1 iminar eng 40684 Jan 5 17:51 dist/polyfills.88f0257676f76560da16.bundle.js
-rw-r--r-- 1 iminar eng 54001 Jan 5 17:51 dist/worker-basic.min.js
PR Close#21349
Chrome 63 can cause the navigationStart event for the first
run to arrive with a different pid than the start of the
benchpress run. This makes the first collected result invalid.
This workaround causes the sampler to ignore runs that have this
condition.
PR Close#21396
Use `-f` when doing `git fetch` for the PR. Without
it the `git fetch` will not overwrite what is currently
fetched locally, in essence doing fast-forward only.
PR Close#21295
The `@internal` tag prevents code items from appearing in the docs and the
typings files. You can now use `@nodoc` if you only want it to be excluded
from the docs and not the typings files.
Closes#20990
PR Close#21024
We redirect non-docs pages in the "archive" deployment back to the stable
deployment. We should not redirect pages in the "next" deployment.
Closes#19505
PR Close#21027
Apparently Object.keys on NamedNodeMap work differently with googlebot :-(
There are not tests since we don't have a way to write tests for googlebot,
but I did manually verify that after this fix googlebot correctly renders
several of the previously broken pages.
Fixes#21272
PR Close#21305
Pass one argument to `logger.error()` to improve error reporting in
environments that do not handle more than one arguments well (e.g.
Googlebot's web rendering service).
Related to #21272.
PR Close#21293
Alex Rickabaugh
Kara Erickson
cexbrayat
Misko Hevery
Matias Niemelä
George Kalpakas
Igor Minar
Alex Eagle
Anton Strogonoff
chembu
Marc Laval
Olivier Combe
lharries
Peter Bacon Darwin
Jesus Rodriguez
Igor Minar
Jason Aden
Siyao Li
courtneypattison
Zenn
Victor Noel
Dawid Winiarczyk
Pawel Kozlowski