Forward Proxy Introduction

The AAF Forward Proxy (or fProxy) is a forward proxy service with credential caching capabilities for incoming REST requests. It is one of the two applications (alongside with Reverse proxy) deployed as a Kubernetes sidecar to the main Primary service.


Forward Proxy:

  • The service will forward all incoming REST requests onto their original endpoints.
  • Add any cached security credentials to the forwarding request

Credential Cache:

The credential cache is a short-lived in-memory cache, keyed on a transaction ID. The following data is cached:

  • Transaction ID - this is the key for retrieving cached values
  • CredentialName - this is the name of the credential to be cached. This should correspond to the header name for a header credential, or the cookie name for a cookie credential.
  • CredentialValue - this is the value associated with the credential. This should correspond to the header value of a header credential, or the cookie contents for a cookie credential.
  • CredentialType - this is the type of the credential to be cached. Currently supported values are: HEADER, COOKIE. The cache has a configurable cache expiry period, so that any cache entries older than the expiry period will be automatically removed from the cache.

Credential Cache REST API:

Credentials can be added to the credential cache by performing a REST POST using the following URL:

(Note that the transaction ID is provided as a URL parameter)

https://<host>:<port>/credential-cache/<transactionid> The body of the request should contain the cached data (described above) in JSON format as follows:

{ "credentialName":"foo", "credentialValue":"bar", "credentialType":"<HEADER/COOKIE>" }

Configuring the fProxy service

The fProxy service is configured through the fproxy.properties file that resides under the ${CONFIG_HOME} environment variable.

The file has the following configurable properties:

  • credential.cache.timeout.ms This is the time in milliseconds that a cache entry will expire after it is added. e.g. 180000
  • transactionid.header.name This is the name of the header in incoming requests that will contain the transaction ID. e.g. X-TransactionId