It is done very often. In the past you could solve glitches between browser engines. Nowadays it is done e.g. to discover mobile clients. In one of my services the easiest to keep foreigners out was rejecting all requests which are not zinc 😉
Norbert > Am 11.10.2018 um 00:32 schrieb Hernán Morales Durand > <hernan.mora...@gmail.com>: > > Wow, didn't knew that someone actually could reject/allow specific UAs. > > Thank you Sven, > > Cheers, > > Hernán > El mié., 10 oct. 2018 a las 17:33, Sven Van Caekenberghe > (<s...@stfx.eu>) escribió: >> >> Because they don't like Pharo or Zinc ;-) >> >> ZnClient new >> systemPolicy; >> beOneShot; >> url: 'http://ifconfig.me/ip'; >> accept: ZnMimeType textPlain; >> headerAt: 'User-Agent' put: 'curl/7.54.0'; >> get. >> >> Changing the User-Agent (effectively lying) works. >> >>> On 10 Oct 2018, at 22:02, Hernán Morales Durand <hernan.mora...@gmail.com> >>> wrote: >>> >>> When I visit this site http://ifconfig.me/ip using the web browser I >>> get the expected text output. However if I try to do it from Pharo 6.1 >>> (Windows 8.1) I get a 403 forbidden response using this code: >>> >>> ZnClient new >>> systemPolicy; >>> beOneShot; >>> accept: ZnMimeType textPlain; >>> timeout: 6000; >>> url: 'http://ifconfig.me/ip'; >>> get. >>> >>> 2018-09-16 03:06:18 011 Retrying ConnectionTimedOut: Cannot connect to >>> 153.121.72.212:80 >>> 2018-09-16 03:06:19 012 Connection Established ifconfig.me:80 >>> 153.121.72.212 288ms >>> 2018-09-16 03:06:19 013 Request Written a ZnRequest(GET /all.xml) 1ms >>> 2018-09-16 03:06:19 014 Response Read a ZnResponse(403 Forbidden >>> text/html;charset=iso-8859-1 209B) 318ms >>> 2018-09-16 03:06:19 015 GET /all.xml 403 209B 319ms >>> 2018-09-16 03:06:19 016 Connection Closed 153.121.72.212:80 >>> >>> In Firefox this is the output >>> >>> Request Headers Firefox: >>> >>> Host: ifconfig.me >>> User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:62.0) >>> Gecko/20100101 Firefox/62.0 >>> Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 >>> Accept-Language: en-US >>> Accept-Encoding: gzip, deflate >>> DNT: 1 >>> Connection: keep-alive >>> Upgrade-Insecure-Requests: 1 >>> >>> Response Headers Firefox: >>> >>> HTTP/1.1 200 OK >>> Date: Sun, 16 Sep 2018 16:47:02 GMT >>> Server: Apache >>> Vary: Accept-Encoding >>> Content-Encoding: gzip >>> Content-Length: 32 >>> Connection: close >>> Content-Type: text/plain >>> >>> >>> Any idea? >>> >>> Cheers, >>> >>> Hernán >>> >> >> >
