I'm doing a web-server/insta example in class, and one of my students (Arlo 
White, cc:'ed) pointed out that  the existing framework for extracting bindings 
seems to be missing a bunch of useful functions. In particular, he volunteered 
to implement a few of the functions from the Spring framework, most notably a 
function that accepts a request and a name and returns the string associated 
with that name in the request's bindings.  Like hash-ref, it would allow you to 
specify your own failure behavior.

I've run into this myself, and it's always a pain to operate on the request 
structures.  Would you be open to adding a few functions like this to the 
web-server (if we provide them, along with docs and tests)? Looking at the 
documentation, it appears that there's some cleanup that just never made it to 
the top of someone's list.

John

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