Problem
You need to consume an external resource via a web service and you are getting the next error on your server logs or in your browser:
Unable to tunnel through proxy. Proxy returns “HTTP/1.1 503 Service Unavailable”
And you don´t have any kind of access or documentation of the environments where your code is running that can tell you if there is a proxy configured or not.
How can you be sure that in fact there is a proxy? and that the Proxy is blocking the communication?, you can add next lines to your code to determine that:
if (LOG.isLoggable(WsLevel.INFO)) {
if ( connection.usingProxy() ) {
LOG.log(WsLevel.INFO, '-- doPost() -- Connection is using proxy');
}
String proxyHost = System.getProperty('http.proxyHost');
if (null != proxyHost) {
LOG.log(WsLevel.INFO, '-- doPost() -- http.proxyHost: ' + proxyHost);
}
String proxyPort = System.getProperty('http.proxyPort');
if (null != proxyPort) {
LOG.log(WsLevel.INFO, '-- doPost() -- http.proxyPort: ' + proxyPort);
}
}
Kudos to my teammate Xavier Muniz by discover this solution.
I really hope you find this information useful.
