Do not crash on URIs without a host component. #16199
Merged
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URIs such as
unix://...
(Unix domain socket) may legitimately be missing ahost component. We should gracefully handle them when looking for a credential
helper (no such helper can exist for them since the lookup is host-based, but
this could change in the future).
Fixes #16171 which is a regression in 5.3. We had some tests for this in
remote_execution_test.sh, but they were disabled due to flakiness in 8e3c0df.
I've filed #16185 to reenable them.
Closes #16184.
PiperOrigin-RevId: 470724658
Change-Id: Ibd7203546f00fe2335c14e7a5fa6d5bf64868bac