In a typical client HTTP request, what is the correct order of the four principal policy checkpoints?

In a typical client HTTP request, the correct order of the four principal policy checkpoints is essential to understanding how the proxy processes requests and responses. The sequence begins with the "Client in" checkpoint, where the proxy receives the request from the client. This involves evaluating any policies or rules that need to be applied based on the client's request, such as authentication or filtering policies.

Next is the "Server out" checkpoint, where the proxy prepares to forward the request to the intended destination server. At this stage, the proxy can implement additional policies, like modifying the request or adding security measures before it is sent out to the server.

After the request has been sent, the "Server in" checkpoint is where the proxy first encounters the response from the server. Here, the response can be examined, and any necessary policies can be enforced, such as caching or content inspection, to assess whether the response conforms to the defined policies.

Finally, the process concludes at the "Client out" checkpoint, where the proxy sends the processed response back to the client. Any final policies that apply to the response can be enforced before it reaches the end user.

This sequence allows for a comprehensive flow of request and response handling, maintaining security and compliance with policies at each stage