Proxy Server between Camunda Client and Remote Server

Camunda 8 Topics
1

Hello,

Ich wrote a custom Jira connector for camunda 8.9 using Camunda Java Spring SDK. The connector has been deployed within a k8s cluster that does not allow traffic to internet. For this connector, I need to make some requests to a remote Jira server thorugh a Forward proxy server. But actually I can’t reach the server using one of three following options:

1st option: JAVA_TOOL_OPTIONS within env var from k8s deployment file

env:
   - name: JAVA_TOOL_OPTIONS
     value: -Dhttp.proxyHost=<HOST> -Dhttps.proxyPort=<PORT> -Dhttps.proxyHost=<HOST> -Dhttps.proxyPort=<PORT>

2nd option: Connector env vars recommended in HTTP proxy configuration | Camunda 8 Docs

env: 
   - name: CONNECTOR_HTTPS_PROXY_HOST
     value: <HOST>
   - name: CONNECTOR_HTTPS_PROXY_PORT
     value: <PORT>
   - name: CONNECTOR_HTTP_PROXY_HOST
     value: <HOST>
   - name: CONNECTOR_HTTP_PROXY_PORT
     value: <PORT>

I also update the configuration of my RestTemplate in code to include the .useSystemProperties() Method like this:

import lombok.extern.slf4j.Slf4j;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;


public class JiraApiRestTemplate extends RestTemplate {

  public JiraApiRestTemplate(RestTemplate source) {
    this.setRequestFactory(createApacheHttpRequestFactory());
    if (source != null) {
      this.setMessageConverters(source.getMessageConverters());
      this.setClientHttpRequestInitializers(source.getClientHttpRequestInitializers());
      this.setErrorHandler(source.getErrorHandler());
      this.setUriTemplateHandler(source.getUriTemplateHandler());
      this.setInterceptors(source.getInterceptors());
    }
  }

  private static HttpComponentsClientHttpRequestFactory createApacheHttpRequestFactory() {
    CloseableHttpClient httpClient = HttpClientBuilder.create().useSystemProperties().build();

    return new HttpComponentsClientHttpRequestFactory(httpClient);
  }
}

But nothing from the options above work. It means for example, when I tried to get an issue with my client, the request never reaches the jira server. On the other hand, I test the connectivity from my proxy server to my jira connector successfully using curl by doing:

curl -I -x http://<PROXY_HOST>:<PROXY_PORT> https://<JIRA_HOST>:<JIRA_PORT>

Can someone tell me why none of the options above work? Do I have to do something else?

2

You’re trying to configure proxy settings for a custom Jira connector using JVM properties, connector-scoped env vars, and RestTemplate’s useSystemProperties(), but none seem to take effect. I found the following relevant resources:

Does this help? If not, can anyone from the community jump in? :waving_hand:

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