httpx

func ClientIP ¶

func ClientIP(r *http.Request) string

ClientIP returns the client's IP address for the given request. It first checks the X-Forwarded-For header, and if present, returns its first element.

Else Request.RemoteAddr is parsed and used.

For details, see https://stackoverflow.com/a/29236630/1705598

func DecodeShortUA ¶

func DecodeShortUA(shortUA string) string

DecodeShortUA decodes the given shortened user agent string into its original form. The shortUA input should be the output of ShortenUserAgent().

func ShortenUserAgent ¶

func ShortenUserAgent(ua string) string

ShortenUserAgent can be used to simplify, shorten user agent strings. It replaces most frequent (and less informative) parts with short sequences. The transformation is a bijection, the short form can be decoded back into the original user agent string, see DecodeShortUA().

Examples:

-system: Chrome Generic Win10
     ua: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
  short: ~Z (~W NT 10.0; Win64; x64) ~a537.36 ~G ~c80.0.3987.132 ~s537.36

-system: Firefox Generic Linux
     ua: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0
  short: ~Z (X11; Ubuntu; ~L x86_64; rv:73.0) ~g20100101 ~f73.0

-system: Safari 13.0 macOS
     ua: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.5 Safari/605.1.15
  short: ~Z (~I; Intel Mac OS X 10_15_3) ~a605.1.15 ~G ~v13.0.5 ~s605.1.15

-system: Safari Apple iPhone XR
     ua: Mozilla/5.0 (iPhone; CPU iPhone OS 12_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Mobile/15E148 Safari/604.1
  short: ~Z (~i; CPU ~i OS 12_0 like Mac OS X) ~a605.1.15 ~G ~v12.0 ~m15E148 ~s604.1

-system: Samsung Galaxy S9
     ua: Mozilla/5.0 (Linux; Android 8.0.0; SM-G960F Build/R16NW) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.84 Mobile Safari/537.36
  short: ~Z (~L; ~A 8.0.0; SM-G960F Build/R16NW) ~a537.36 ~G ~c62.0.3202.84 ~M ~s537.36

The goal is not to produce the shortest output, but to provide a reasonably short output while maintaining readability.