runtime/runtime_impl_jetty9/src/main/java/com/google/apphosting/runtime/jetty9/UPRequestTranslator.java [287:362]:
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  private void requestHeader(
      UPRequest.Builder upReqBuilder, HttpRequest.Builder httpRequest, String name, String value) {
    if (Strings.isNullOrEmpty(value)) {
      return;
    }
    String lower = Ascii.toLowerCase(name);
    switch (lower) {
      case X_APPENGINE_TRUSTED_IP_REQUEST:
        // If there is a value, then the application is trusted
        // If the value is IS_TRUSTED, then the user is trusted
        httpRequest.setTrusted(value.equals(IS_TRUSTED));
        upReqBuilder.setIsTrustedApp(true);
        break;

      case X_APPENGINE_HTTPS:
        httpRequest.setIsHttps(value.equals("on"));
        break;

      case X_APPENGINE_USER_IP:
        httpRequest.setUserIp(value);
        break;

      case X_FORWARDED_PROTO:
        httpRequest.setIsHttps(value.equals("https"));
        break;

      case X_CLOUD_TRACE_CONTEXT:
        try {
          TraceContextProto proto = TraceContextHelper.parseTraceContextHeader(value);
          upReqBuilder.setTraceContext(proto);
        } catch (NumberFormatException e) {
          logger.atWarning().withCause(e).log("Could not parse trace context header: %s", value);
        }
        break;

      case X_GOOGLE_INTERNAL_SKIPADMINCHECK:
        // may be set by X_APPENGINE_QUEUENAME below
        if (upReqBuilder.getRuntimeHeadersList().stream()
            .map(ParsedHttpHeader::getKey)
            .noneMatch(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC::equalsIgnoreCase)) {
          upReqBuilder.addRuntimeHeaders(
              createRuntimeHeader(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC, "true"));
        }
        break;

      case X_APPENGINE_QUEUENAME:
        httpRequest.setIsOffline(true);
        // See b/139183416, allow for cron jobs and task queues to access login: admin urls
        if (upReqBuilder.getRuntimeHeadersList().stream()
            .map(ParsedHttpHeader::getKey)
            .noneMatch(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC::equalsIgnoreCase)) {
          upReqBuilder.addRuntimeHeaders(
              createRuntimeHeader(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC, "true"));
        }
        break;

      case X_APPENGINE_TIMEOUT_MS:
        upReqBuilder.addRuntimeHeaders(createRuntimeHeader(X_APPENGINE_TIMEOUT_MS, value));
        break;

      case X_GOOGLE_INTERNAL_PROFILER:
        try {
          TextFormat.merge(value, upReqBuilder.getProfilerSettingsBuilder());
        } catch (IOException ex) {
          throw new IllegalStateException("X-Google-Internal-Profiler read content error:", ex);
        }
        break;

      default:
        break;
    }
    if (passThroughPrivateHeaders || !PRIVATE_APPENGINE_HEADERS.contains(lower)) {
      // Only non AppEngine specific headers are passed to the application.
      httpRequest.addHeadersBuilder().setKey(name).setValue(value);
    }
  }
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runtime/runtime_impl_jetty12/src/main/java/com/google/apphosting/runtime/jetty/proxy/UPRequestTranslator.java [272:347]:
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  private void requestHeader(
      UPRequest.Builder upReqBuilder, HttpRequest.Builder httpRequest, String name, String value) {
    if (Strings.isNullOrEmpty(value)) {
      return;
    }
    String lower = Ascii.toLowerCase(name);
    switch (lower) {
      case X_APPENGINE_TRUSTED_IP_REQUEST:
        // If there is a value, then the application is trusted
        // If the value is IS_TRUSTED, then the user is trusted
        httpRequest.setTrusted(value.equals(IS_TRUSTED));
        upReqBuilder.setIsTrustedApp(true);
        break;

      case X_APPENGINE_HTTPS:
        httpRequest.setIsHttps(value.equals("on"));
        break;

      case X_APPENGINE_USER_IP:
        httpRequest.setUserIp(value);
        break;

      case X_FORWARDED_PROTO:
        httpRequest.setIsHttps(value.equals("https"));
        break;

      case X_CLOUD_TRACE_CONTEXT:
        try {
          TraceContextProto proto = TraceContextHelper.parseTraceContextHeader(value);
          upReqBuilder.setTraceContext(proto);
        } catch (NumberFormatException e) {
          logger.atWarning().withCause(e).log("Could not parse trace context header: %s", value);
        }
        break;

      case X_GOOGLE_INTERNAL_SKIPADMINCHECK:
        // may be set by X_APPENGINE_QUEUENAME below
        if (upReqBuilder.getRuntimeHeadersList().stream()
            .map(ParsedHttpHeader::getKey)
            .noneMatch(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC::equalsIgnoreCase)) {
          upReqBuilder.addRuntimeHeaders(
              createRuntimeHeader(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC, "true"));
        }
        break;

      case X_APPENGINE_QUEUENAME:
        httpRequest.setIsOffline(true);
        // See b/139183416, allow for cron jobs and task queues to access login: admin urls
        if (upReqBuilder.getRuntimeHeadersList().stream()
            .map(ParsedHttpHeader::getKey)
            .noneMatch(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC::equalsIgnoreCase)) {
          upReqBuilder.addRuntimeHeaders(
              createRuntimeHeader(X_GOOGLE_INTERNAL_SKIPADMINCHECK_UC, "true"));
        }
        break;

      case X_APPENGINE_TIMEOUT_MS:
        upReqBuilder.addRuntimeHeaders(createRuntimeHeader(X_APPENGINE_TIMEOUT_MS, value));
        break;

      case X_GOOGLE_INTERNAL_PROFILER:
        try {
          TextFormat.merge(value, upReqBuilder.getProfilerSettingsBuilder());
        } catch (IOException ex) {
          throw new IllegalStateException("X-Google-Internal-Profiler read content error:", ex);
        }
        break;

      default:
        break;
    }
    if (passThroughPrivateHeaders || !PRIVATE_APPENGINE_HEADERS.contains(lower)) {
      // Only non AppEngine specific headers are passed to the application.
      httpRequest.addHeadersBuilder().setKey(name).setValue(value);
    }
  }
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