huawei-cloud/servicestage/src/main/java/org/apache/servicecomb/huaweicloud/servicestage/RBACBootStrapService.java [97:110]:
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    if (isProxyEnable(environment)) {
      HttpClientBuilder httpClientBuilder = HttpClientBuilder.create().
          setDefaultRequestConfig(HttpTransportFactory.defaultRequestConfig().build());
      HttpHost proxy = new HttpHost(getProxyHost(environment),
          getProxyPort(environment), "http");  // now only support http proxy
      httpClientBuilder.setProxy(proxy);
      CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
      credentialsProvider.setCredentials(new AuthScope(proxy),
          new UsernamePasswordCredentials(getProxyUsername(environment),
              getProxyPasswd(environment)));
      httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);

      return HttpTransportFactory
          .createHttpTransport(sslProperties,
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service-registry/registry-service-center/src/main/java/org/apache/servicecomb/registry/sc/SCClientUtils.java [75:88]:
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    if (isProxyEnable(environment)) {
      HttpClientBuilder httpClientBuilder = HttpClientBuilder.create().
          setDefaultRequestConfig(HttpTransportFactory.defaultRequestConfig().build());
      HttpHost proxy = new HttpHost(getProxyHost(environment),
          getProxyPort(environment), "http");  // now only support http proxy
      httpClientBuilder.setProxy(proxy);
      CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
      credentialsProvider.setCredentials(new AuthScope(proxy),
          new UsernamePasswordCredentials(getProxyUsername(environment),
              getProxyPasswd(environment)));
      httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);

      return HttpTransportFactory
          .createHttpTransport(sslProperties,
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