url-http-content-length-after-change-function

url-http-content-length-after-change-function is a compiled Lisp function in `url-http.el'.

(url-http-content-length-after-change-function ST ND LENGTH)

Function used when we DO know how long the document is going to be.
More sophisticated percentage downloaded, etc.
Also does minimal parsing of HTTP headers and will actually cause
the callback to be triggered.