Java：未使用-Dhttps.proxyHost

Question

I have a java application running on Tomcat in EC2 and I would like to reach a different EC2 endpoint via a proxy. Let's call the source https://source.com and destination https://destination.com and the proxy https://proxy.com

The symptom I have is the following:

1. Hitting the endpoint from my source server works:
   • wget destination.com returns an output including connecting to the proxy and then connecting to destination.com with a 200 ok.
2. When I try to make the call using postman via the API on the source, I get the below error:

org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://destination.com": Connect to destination.com:80 ... connect timed out; nested exception is org.apache.http.conn.ConnectTimeoutException

Things I've done:

• Verify that the http and https proxy is exported
  • I have both of these exported as an environment variable:
  • http_proxy=http://destination.com:80 https_proxy=http://destination.com:80

• Verify that java_opts include the proxy info as well:

  • running ps -ef | grep app_name ps -ef | grep app_name returns the following:

  • -Dhttp.proxyHost=destination.com -Dhttp.proxyPort=80 -Dhttps.proxyHost=destination.com -Dhttps.proxyPort=80

Even with these information exported and in the java_opts (set in setenv.sh ), it seems like the API is not using the proxy to reach the destination, because from the server, I can use wget/curl to reach the endpoint via the proxy. Could there be another reason/location that I missed which is causing the API to not use the proxy?

My java version here: java -version java version "1.8.0_91" Java(TM) SE Runtime Environment (build 1.8.0_91-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

Thanks in advance.

Answer 1

You aren't using the Java API. http[s].proxyHost is for HttpURLConnection and friends. You appear to be using the Apache HTTP client, which evidently doesn't support them.