[#1576] Fixes unexpected premature close on chunked responses #1687
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Purpose
Fixes #1576 (unexpected premature close errors on chunked responses)
Changes
It corrects a false assumption about split of the 'LAST CHUNK' marker between the previous and current buffer. The new solution concatenates last bytes of the previous buffer with all bytes from the current buffer (if that holds less then 5 bytes) and does the check on that.
Additional information
Premature close
errors unexpectedly but very reliably in specific circumstances #1576