Retry the streaming portion of downloads, as well as the setup. (Cherry-pick of #17298) #17302
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
As reported in #17294, if an HTTP stream is interrupted after it has opened, the retry that was added in #16798 won't kick in.
This change moves the retry up a level to wrap the entire download attempt, and adds a test of recovering from "post-header" errors.
Fixes #17294.