Setting user agent of a java URLConnection

Question

I m trying to parse a webpage using Java with URLConnection  I try to set up the user-agent like this   java net URLConnection c   url openConnection    c setRequestProperty  User-Agent    Mozilla 5 0  Macintosh  U  Intel Mac OS X 10 4  en-US  rv 1 9 2 2  Gecko 20100316 Firefox 3 6 2      But the resulting user agent is the one I specify  with  Java 1 5 0 19  appended to the end  Is there a way to truly set the user agent without this addition

User · Accepted Answer

Off hand  setting the http agent system property to    might do the trick  I don t have the code in front of me    You might get away with    System setProperty  http agent          but that might require a race between you and initialisation of the URL protocol handler  if it caches the value at startup  actually  I don t think it does    The property can also be set through JNLP files  available to applets from 6u10  and on the command line   -Dhttp agent    Or for wrapper commands   -J-Dhttp agent

User · Answer

its work for me  set the User-Agent in the addRequestProperty   URL url   new URL  lt URL gt    HttpURLConnection httpConn    HttpURLConnection  url openConnection    httpConn addRequestProperty  User-Agent   Mozilla 5 0  Windows NT 6 1  Win64  x64  rv 56 0  Gecko 20100101 Firefox 56 0

User · Answer

Just for clarification  setRequestProperty  User-Agent    Mozilla       now works just fine and doesn t append java xx at the end  At least with Java 1 6 30 and newer   I listened on my machine with netcat a port listener      nc -l -p 8080   It simply listens on the port  so you see anything which gets requested  like raw http-headers   And got the following http-headers without setRequestProperty   GET  foobar HTTP 1 1 User-Agent  Java 1 6 0 30 Host  localhost 8080 Accept  text html  image gif  image jpeg     q  2       q  2 Connection  keep-alive   And WITH setRequestProperty   GET  foobar HTTP 1 1 User-Agent  Mozilla 5 0  Macintosh  U  Intel Mac OS X 10 4  en-US  rv 1 9 2 2  Gecko 20100316 Firefox 3 6 2 Host  localhost 8080 Accept  text html  image gif  image jpeg     q  2       q  2 Connection  keep-alive   As you can see the user agent was properly set   Full example   import java io IOException  import java net URL  import java net URLConnection    public class TestUrlOpener        public static void main String   args  throws IOException           URL url   new URL  http   localhost 8080 foobar            URLConnection hc   url openConnection            hc setRequestProperty  User-Agent    Mozilla 5 0  Macintosh  U  Intel Mac OS X 10 4  en-US  rv 1 9 2 2  Gecko 20100316 Firefox 3 6 2             System out println hc getContentType

User · Answer

HTTP Servers tend to reject old browsers and systems   The page   Tech Blog  wh   Most Common User Agents reflects the user-agent property of your current browser in section  Your user agent is    which can be applied to set the request property  User-Agent  of a java net URLConnection or the system property  http agent

[java] Setting user agent of a java URLConnection

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