Beginning October 1, 2012 all requests to the Data API will need to be signed with an access key provided by HathiTrust. Access keys for programmatic uses of the Data API can be obtained at http://babel.hathitrust.org/cgi/kgs/request. HathiTrust has also created a Web client that employs a user’s login credentials as a proxy for an access key to facilitate non-programmatic uses. Complete documentation of the security enhancements, methods of obtaining keys, how to sign requests, and how to access the Web client is available in the Data API documentation below.
Also effective October 1, the host “services.hathitrust.org” will no longer exist for the Data API. The new host will be “babel.hathitrust.org”, the same host as the PageTurner and other HathiTrust services. Calls to the Data API will therefore need to use URLs such as the following (note the additional “cgi” in the path):
Data API Documentation
Version 0.9, Revised 10 September 2012 - Download PDF