AccessLog format consists of following three parts, the keys of each part are linked by “%” and blank space:

part1:RequestInfoFormat
part2:RequestHeaderFormat
Part3:ResponseHeaderFormat

For part1, the request information contains keys(case sensitive):

• StartTime
• RequestReceivedDuration
• ResponseReceivedDuration
• BytesSent
• BytesReceived
• Protocol
• ResponseCode
• Duration
• ResponseFlag
• UpstreamLocalAddress
• DownstreamLocalAddress

  so you can choose above keys optionally to define part1 format such as

  RequestInfoFormat = "%StartTime% %Protocol% %ResponseCode%"

For Part2 and Part3, you should define keys according to protocols you choose in format:

For Part2,your format begins with ‘REQ.’, such as:

RequestHeaderFormat = "%REQ.part1% %REQ.part2% %REQ.part3%..."

For part3, your format begins with “Resp.” , such as:

ResponseHeaderForamt = "%RESP.part1% %RESP.part2% %RESP.part3%..."

As a whole, the final format looks like:

format = "%StartTime% %Protocol% %ResponseCode% %REQ.part1% %REQ.part2% %RESP.part1% %RESP.part2%"

we will parse the details and get the content from headers, then log them