Hosted Targets FAQ

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Is there a limit to the number of Hosted Targets I can create or deploy?

See the Apigee Edge Cloud Comparison Matrix specification sheet for information on Hosted Target entitlements for your plan.

Is there management API support for Hosted Target proxies?

No new management APIs were created or existing APIs changed to support Hosted Targets; however, you can use existing management APIs to deploy and manage proxies that use Hosted Targets, as long as the Hosted Target proxies are properly constructed. See also Required directory structure for your Node.js app.

Can I use IP allowlisting to secure my target backend?

The technology upon which Hosted Targets is built, Google App Engine (GAE), does not provide a way to give a static IP address to an app. GAE uses an IP pool range; therefore, it may be possible to allow a range of IP addresses. For more information, refer to this GAE FAQ entry, Static IP Addresses and App Engine apps.

Can I put multiple <HostedTarget> target endpoints in one proxy?

No. Only one Hosted Target application is deployed per proxy. The deployed application is the one located in the proxy's resources/hosted directory.

Is it possible to work around the lack of apigee-access?

You cannot use the apigee-access module in Hosted Targets apps. If you use traditional, embedded Node.js with apigee-access and want to migrate to Hosted Targets, consider the following possibilities:

  • Use Edge policies - Where possible, use standard Edge policies to replace what your existing apigee-access code does.
  • Use headers - You can put KVM values and flow variables to your Node.js application in HTTP request headers. This strategy works for KVM values or flow variables that are available in the request flow of the API proxy.
  • Use environment variables - You can set environment variables whose values are provided by the KVM. This is documented in the manifest file portion of the user guide.

Can I use Java Keystores (JKS) Files for TLS?

Hosted Targets does not support JKS for TLS as a replacement for PEM files, see previous documentation here. Hosted Targets uses native Node.js and thus uses OpenSSL natively. Please refer to the TLS (SSL) documentation provided by Node.js docs when setting up TLS/SSL connections.

What's the best way to manage temporary files?

Always delete temporary files. Local disk storage in the temporary directory is an in-memory filesystem. All files that you write consume memory available to your function. Files that you write are usually available at consecutive invocations, therefore failing to delete these files may eventually lead to an out-of-memory error and a subsequent cold start.

Do not attempt to write outside of the temporary directory. Also, use platform-independent methods such as os.tmpdir() and path.join() to construct the temporary file path, so that your functions also work on the emulator on any platform.

For more information, see this Google Cloud document.

Can I deploy multiple proxy revisions?

Apigee Edge allows you to deploy multiple revisions of a proxy to an environment with different basepaths; however, this behavior is not supported for Hosted Targets.

Is there a limit on request header size?

For the most recent versions of Node.js (11.3.0+) as well as LTS versions including 6.14.0+, 8.14.0+, and 11.3.0+, the maximum request header size that you can use in a Node.js application is 8 KB. If you want to pass headers that are bigger that 8 KB, specify another version of Node.js that is not on the above list. You can do this in the application's manifest file. For example:

  runtime: node
  runtimeVersion:6.4.1
  application:my-express-app
  env:
    - name: NODE_ENV
      value: production
    - name: LOG_LEVEL
      value: 3

Can I use HTTP response streaming for Hosted Targets?

HTTP response streaming is not supported for Hosted Targets, because the technology upon which Hosted Targets is built, Google App Engine (GAE), does not support streaming.

Is there a request timeout limit?

Google App Engine (GAE) imposes a 60 second request timeout. See also Quotas and limits in the GAE documentation.