php - Howto Know difference - clicked Link vs email preview - for 1 time use URL's? -


i'm using email text gateway url stops further email texts. when text arrives on phone, provider preview attempt on url - triggers application stop sending future texts.

is there way tell difference - way of env variables (php) running because clicked on link , not cellular provider doing preview attempt?

i'm using apache web server, php server side.

previously i've used ip check see if "barracuda" remote address , ignore - has not been successful - added new ip address blocks. seemed cellular provider using barracuda email->text gateway email services.

wondering if has better suggestion keep searching logs new ip blocks add application.

the log entries are: first hits base domain name, hits base url, full url itself.

64.74.215.166 - - [24/jul/2017:19:02:47 -0600] "get / http/1.1" 200 882 "-" "mozilla/5.0 (windows nt 6.1) applewebkit/537.36 (khtml, gecko) chrome/56.0.2924.76 safari/537.36"

64.74.215.176 - - [24/jul/2017:19:03:14 -0600] "get /myapi.php http/1.1" 200 203 "-" "mozilla/5.0 (windows nt 6.1) applewebkit/537.36 (khtml, gecko) chrome/56.0.2924.76 safari/537.36"

64.74.215.146 - - [24/jul/2017:19:03:17 -0600] "get /myapi.php?command=textstop&event=2017-07-24%7c20:42:52.188811 http/1.1" 200 203 "-" "mozilla/5.0 (windows nt 6.1) applewebkit/537.36 (khtml, gecko) chrome/56.0.2924.76 safari/537.36"

any thoughts on how tell difference between preview url access , actual url access?

thanks


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