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web: Be less strict when parsing entity tags.

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* module/web/http.scm (parse-entity-tag): Be less strict, accepting
  unquoted strings as well.

* test-suite/tests/web-http.test ("response headers"): Add a test for
  etag parsing.
This commit is contained in:
Andy Wingo 2016-01-07 10:53:57 +01:00 • committed by Ludovic Courtès
parent 5c8b3be820
commit c5dac3595f
2 changed files with 9 additions and 3 deletions
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11
module/web/http.scm
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@ -848,10 +848,15 @@ as an ordered alist."
(display-digits (date-second date) 2 port)
(display " GMT" port)))
;; Following https://tools.ietf.org/html/rfc7232#section-2.3, an entity
;; tag should really be a qstring. However there are a number of
;; servers that emit etags as unquoted strings. Assume that if the
;; value doesn't start with a quote, it's an unquoted strong etag.
(define (parse-entity-tag val)
(if (string-prefix? "W/" val)
(cons (parse-qstring val 2) #f)
(cons (parse-qstring val) #t)))
(cond
((string-prefix? "W/" val) (cons (parse-qstring val 2) #f))
((string-prefix? "\"" val) (cons (parse-qstring val) #t))
(else (cons val #t))))
(define (entity-tag? val)
(and (pair? val)