HTTP
HTTP GET
HTTP replaced headers
CURLOPT_TIMECONDITION
If-Modified-Since
# Server-side
HTTP/1.1 503 Error
Date: Thu, 11 Jul 2019 02:26:59 GMT
Server: test-server/swsclose
Retry-After: 22
# Client-side
http
HTTP Retry-After header parsing and extraction
lib1594
http://%HOSTIP:%HTTPPORT/1594
GET /1594 HTTP/1.1
Host: %HOSTIP:%HTTPPORT
Accept: */*
Retry-After: 22