Passing this along to the storage team. Would it be worth adding a unit test to test this case? @crwilcox @frankyn

This PR breaks existing unit tests which assert that a slash in the blob name is not escaped, e.g.:

__________________ Test_Blob.test_public_url_w_slash_in_name ___________________
self = <tests.unit.test_blob.Test_Blob testMethod=test_public_url_w_slash_in_name>
    def test_public_url_w_slash_in_name(self):
        BLOB_NAME = "parent/child"
        bucket = _Bucket()
        blob = self._make_one(BLOB_NAME, bucket=bucket)
        self.assertEqual(
>           blob.public_url, "https://storage.googleapis.com/name/parent/child"
        )
E       AssertionError: 'https://storage.googleapis.com/name/parent%2Fchild' != 'https://storage.googleapis.com/name/parent/child'
E       - https://storage.googleapis.com/name/parent%2Fchild
E       ?                                           ^^^
E       + https://storage.googleapis.com/name/parent/child
E       ?                                           ^
tests/unit/test_blob.py:344: AssertionError

which would re-open #3809 (fixed in #4716).

Hi @MewX, could you add "/" as a safe character as well? gsutil also does this at https://github.com/GoogleCloudPlatform/gsutil/pull/783/files#diff-2203ca5e293c09b69dae32ab51ee067aR543

Hi @frankyn, I have reverted my change to 0d4d991 which included / as a safe character.

However, that commit encountered a test failure:

Infrastructure error. Please apply label 'kokoro:force-run' to rerun the build.

Hi @MewX, that's our CI being flaky. I've re-triggered the tests.

Hi @busunkim96, the test failed again with the same error message. Would you like to take a look at the issue?

The Core Kokoro job fails due to a Kokoro-internal glitch.

Hi @tseaver, could you or anyone please take a look at this bug fix?

A customer might be waiting for this bug fix. Thanks!

@MewX rerunning tests. Thank you for your patience.

@tseaver @crwilcox the test has ran for 3 hours and hasn't completed. Is this normal for Storage IT?

@frankyn No idea if that's normal or not, but I just kicked off the storage job manually.

@MewX I've just pushed PR #8434, which adds explicit unit test coverage for all the cases where _quote is used. In order to make them all pass, I had to add the safe parameter to it: anything where the URL is passed to the JSON API must percent quote /, but anything touching the XML API should not.