gateway-service-hive/src/main/java/org/apache/knox/gateway/hive/HiveDispatchUtils.java [30:41]:
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  public static void addCredentialsToRequest(HttpUriRequest request) {
    String principal = SubjectUtils.getCurrentEffectivePrincipalName();
    if ( principal != null ) {
      UsernamePasswordCredentials credentials =
          new UsernamePasswordCredentials(principal, PASSWORD_PLACEHOLDER);
      try {
        request.addHeader(new BasicScheme().authenticate(credentials, request, null));
      } catch (AuthenticationException e) {
        // impossible
      }
    }
  }
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gateway-service-impala/src/main/java/org/apache/knox/gateway/impala/ImpalaDispatchUtils.java [30:41]:
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  public static void addCredentialsToRequest(HttpUriRequest request) {
    String principal = SubjectUtils.getCurrentEffectivePrincipalName();
    if ( principal != null ) {
      UsernamePasswordCredentials credentials =
          new UsernamePasswordCredentials(principal, PASSWORD_PLACEHOLDER);
      try {
        request.addHeader(new BasicScheme().authenticate(credentials, request, null));
      } catch (AuthenticationException e) {
        // impossible
      }
    }
  }
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