ZIPCheck (C#/ASP.NET)

ZIPCheck is a small service that validates US Zip Code values.

Service and Client

• A live instance of the service is running here: http://amundsen.com/examples/zipcheck/zipcheck.ashx
• An HTML Client (w/ pointers to source code) can be found here: http://amundsen.com/examples/zipcheck/

Using the ZIPCheck Service

To use this service you simply send a query string that looks like this:

http://amundsen.com/examples/zipcheck/zipcheck.ashx?{zipcode}

where

{zipcode} contains one or more digits.

The service returns either:

• 200 OK and a green check image
• 404 Not Found and a red X image

Example Usage

• http://amundsen.com/examples/zipcheck/zipcheck.ashx?90210 returns
• http://amundsen.com/examples/zipcheck/zipcheck.ashx?9021X returns

Notes

• Valid (200 OK) responses contain a caching header good for three hours: (Cache-Control : "public,max-age=108000")
• ZIPCheck is a read-only service and only supports HTTP GET calls.