- From: Yaron Goland <yarong@microsoft.com>
- Date: Sat, 16 Jan 1999 22:44:02 -0800
- To: "'gclemm@atria.com'" <gclemm@atria.com>, w3c-dist-auth@w3.org
http://lists.w3.org/Archives/Public/w3c-dist-auth/1998JulSep/0113.html > -----Original Message----- > From: gclemm@atria.com [mailto:gclemm@atria.com] > Sent: Saturday, January 16, 1999 8:56 AM > To: w3c-dist-auth@w3.org > Subject: Protocol Design: new XML elements in the body or new headers? > > > Many of the new methods being defined for WebDAV versioning have > an XML document as the value of their request and/or response body. > While designing the protocol, I am continually faced with the > question: > > Should an input parameter to the method be represented as a new XML > element in the request body or as a new request header? Similarly, > should an output parameter to the method be represented as a new XML > element in the response body or as a new respose header? > > In each case, there is backward compatibility, since downlevel clients > would just not generate the header/element, and downlevel servers > would just ignore the unknown header/element. > > An argument for the XML element is that the contents of the > XML element > can hold a much wider range of data, and can have its > structure defined, > at least in a coarse syntactic fashion, with a DTD. > > Another argument for the XML element is that you don't have to worry > about proxies stripping off headers they don't recognize. > > The only argument I can think of for using a header is that it is > the only technique applicable when the body is being used for some > other purpose (such as GET/PUT). > > One possible rule of thumb: > > If the request/response body is an XML document, then the > request/response > parameters should be specified as XML elements. Only if the > body is not an > XML document should parameters be specified as headers. > > Comments? > > Cheers, > Geoff > > --- > Geoffrey M. Clemm > Chief Engineer, Configuration Management Business Unit > Rational Software Corporation > (781) 676-2684 geoffrey.clemm@rational.com http://www.rational.com >
Received on Sunday, 17 January 1999 01:44:06 UTC