[THRIFT-5188] Occasional ERROR_INSUFFICIENT_BUFFER at WinHttpQueryHeaders()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Component/s: Delphi - Library
• Patch Info: Patch Available
• Assignee: Jens Geyer
• Reporter: Jens Geyer
• Created: 27/Apr/20 19:04
• Updated: 11/Feb/21 22:27
• Resolved: 27/Apr/20 20:59

Description

Calls WinHttpQueryHeaders() sometimes return error 122 (ERROR_INSUFFICIENT_BUFFER) even if the buffer is large enough, leading TWinHTTPRequestImpl.QueryTotalResponseSize() to fail..

According to the docs, WINHTTP_QUERY_FLAG_NUMBER always returns a 32 bit number (which it indeed does), but for some strange reason since win 10 build 18636.815 passing a DWORD sized buffer is sometimes not enough anymore