Automatic merge from submit-queue (batch tested with PRs 49081, 49318, 49219, 48989, 48486) Use case-insensitive header keys for `--requestheader-group-headers`. This flag is documented as being case-insensitive, but the code was doing a case-sensitive map lookup. **Release note**: ```release-note Bug fix: Parsing of `--requestheader-group-headers` in requests should be case-insensitive. ```
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