Really fix semicolons in URL

src/dispatcher-tree.rkt

@@ -35,6 +35,7 @@
 
 (define (make-dispatcher-tree ds)
   (define subdomain-dispatcher (hash-ref ds 'subdomain-dispatcher))
+  (define tree
     (sequencer:make
      subdomain-dispatcher
      (pathprocedure:make "/" (hash-ref ds 'page-home))
@@ -55,3 +56,19 @@
          (λ (_conn _req) (next-dispatcher)))
      (hash-ref ds 'static-dispatcher)
      (lift:make (hash-ref ds 'page-not-found))))
+  (make-semicolon-fixer-dispatcher tree))
+
+(define ((make-semicolon-fixer-dispatcher orig-dispatcher) conn orig-req)
+  (define orig-uri (request-uri orig-req))
+  (define pps (url-path orig-uri)) ; list of path/param structs
+  (define new-path
+    (for/list ([pp pps])
+      (if (null? (path/param-param pp))
+          pp
+          ;; path/param does have params, which need to be fixed into a semicolon.
+          (path/param
+           (string-append (path/param-path pp) ";" (string-join (path/param-param pp) ";"))
+           null))))
+  (define new-uri (struct-copy url orig-uri [path new-path]))
+  (define new-req (struct-copy request orig-req [uri new-uri]))
+  (orig-dispatcher conn new-req))