java URL working on browser but not in client program

Question

Client JAVA Program part :

    try
                            {

                             String downloadUrl1="https://www......&downloaded=1";
                             url = new URL(downloadUrl1);
                             URLConnection myURLConnection = url.openConnection();
                             myURLConnection.connect();
                             updateMsg.setText("Success");
                             logger.debug(downloadUrl1);
                            }
                            catch (MalformedURLException e) {                              
                                // new URL() failed
                                logger.debug(e);
                            } 
                            catch (IOException e) {   
                                // openConnection() failed
                                logger.debug(e);
                            }

The Success Message is shown , the url is also printed in log file , no Exception is thrown .

Server side Program Part :

$downloaded_status_by_clnt = Sanitize::escape ( $_GET ['downloaded'] );

 if($downloaded_status_by_clnt=='1')
 {
     // Do some update                             
 }
 else
 {
    // Some file reading code
 }

 exit(0);

The update is working when I paste the URL in browser , but not working through program.

Can Anyone please suggest a solution ?

score 1 · Answer 1 · edited May 23 '17 at 11:47

1

The Java code "connects" to the URL but does not attempt to read the content, or even check the status code.

If all you are trying to do is to connect, then the code works. If not ... will you need to add code to do the rest of ... whatever it is that you are trying to do.

There are numerous examples on the web of reading from a URL in Java. For example:

Read url to string in few lines of java code

edited May 23 '17 at 11:47

Community

1
1

answered May 08 '17 at 10:16

Stephen C

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What changes I need to do if I want to read the downloaded parameter value from the URL ? In PHP server side and in JAVA client side ? – Shahrin May 08 '17 at 10:53
Quoting my answer: *"There are numerous examples on the web of reading from a URL in Java"* – Stephen C May 08 '17 at 11:09

score 0 · Answer 2 · answered May 08 '17 at 09:31

Check the HTTP proxy if you are running the code in your organization. Browser might already have the proxy.

You can use the System properties to provide proxy host and port. (There are other ways to do that as well)

-Dhttp.proxyHost=yourProxyHost -Dhttp.proxyPort=yourProxyPort -Dhttps.proxyHost=yourProxyHost -Dhttps.proxyPort=yourProxyPort

score 0 · Answer 3 · answered May 05 '22 at 01:23

Spent several hours trying to solve the problem, and it turns out that I had to change the "User-Agent" header sent from Request. For instance,

HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://example.com"))
                .headers("User-Agent","Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36")      
                .POST(HttpRequest.BodyPublishers.noBody())
                .build();

java URL working on browser but not in client program

3 Answers3