[CMake] about http_proxy env var for download with cmake

[nader.akhres at laposte.net]

Just to give back some info I've found:

* it's recommanded to use http_proxy (with lower case), because upper case will be deprecated in last curl version:
"http_proxy is an exception as it is only available in lower case. " from http://curl.haxx.se/docs/manpage.html
* here is the syntax for proxy with authentication:
http_proxy=login:password at host:port

*here is a little macro I use to deal with http errors (which return no error!):

#DOWNLOAD() aims to correct bug from "file(download..." which don't deal with http errors
MACRO(FILE_DOWNLOAD url filename error_code error_message)
  file(DOWNLOAD ${url} ${filename} STATUS DOWNLOAD_STATUS LOG DOWNLOAD_LOG)
  #message(STATUS "STATUS=${DOWNLOAD_STATUS} LOG=${DOWNLOAD_LOG}")
  LIST(GET DOWNLOAD_STATUS 0 ${error_code})
  LIST(GET DOWNLOAD_STATUS 1 ${error_message})
 
  IF(${error_code} EQUAL 0) #look for http error if any
      string(REGEX MATCH "HTTP/1.[0-9] [0-9][0-9][0-9] [a-zA-Z ]*" ${error_message} ${DOWNLOAD_LOG})
      string(REGEX MATCH "[0-9][0-9][0-9]" ${error_code} ${${error_message}})
      string(REGEX REPLACE "HTTP/1.[0-9] [0-9][0-9][0-9] " "" ${error_message} ${${error_message}})
      IF(${error_code} EQUAL 200)
          set(${error_code} 0)
      ENDIF(${error_code} EQUAL 200)
  ENDIF(${error_code} EQUAL 0)
 
  IF(NOT (${error_code} EQUAL 0)) #remove partial file if any error
      file(REMOVE ${filename})
  ENDIF(NOT (${error_code} EQUAL 0))
   
  #message(STATUS "error_code=${${error_code}}")
  #message(STATUS "error_message=${${error_message}}")
ENDMACRO(FILE_DOWNLOAD)

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