Fixed
- Stop the cURL multi handler busy-waiting on request delays shorter than one second
- Stop cURL HEAD requests with request bodies hanging on responses that declare a content length
- The cURL handler no longer transmits request bodies on HEAD requests
- Preserve response headers when a response includes HTTP trailers
- Harden cURL response header block detection when HTTP trailers are received
- Corrected the PSR-7 class names in the Pool iterator exception
- Redirect body rewind failures no longer leak a bare
RuntimeException