set the scene for mime handling. however, some changes to how internal state is handled will need to be made before adding plaintext rendering.

client.rkt

@@ -80,6 +80,23 @@
           (let ([url (gmi:match-link document-object line)])
             (get (combine-url/relative current-url (url->string url))))))
 
+    (define/private (handle-gmi url c-in)
+      (let-values ([(doc) (gmi:parse (port->lines c-in))]
+                   [(db-in db-out) (make-pipe #f)])
+
+        (set! document-object doc)
+
+        (set! document-buffer db-in)
+        (parameterize ([current-output-port db-out])
+          (gmi:render doc))
+
+        (set! current-url url)
+
+        (let ([remaining (pipe-content-length db-in)])
+          (printf "document retrieved. ~a bytes\n" remaining))
+
+        (next-cmd)))
+
     (define/private (get url)
       (define (iter url depth)
         (with-handlers
@@ -90,7 +107,7 @@
               (λ (exn)
                 (displayln (exn-message exn)))])
 
-            (let-values ([(status header c-in) (net:request url)])
+            (let-values ([(status meta c-in) (net:request url)])
               ;; TODO there are bunch of other status codes to deal with for
               ;; compliance
               (cond
@@ -109,28 +126,19 @@
                 [(and (>= status 20)
                       (<= status 29))
 
-                 (let-values ([(doc) (gmi:parse (port->lines c-in))]
-                              [(db-in db-out) (make-pipe #f)])
-
-                   (set! document-object doc)
-
-                   (set! document-buffer db-in)
-                   (parameterize ([current-output-port db-out])
-                     (gmi:render doc))
-
-                   (set! current-url url)
-
-                   (let ([remaining (pipe-content-length db-in)])
-                     (printf "document retrieved. ~a bytes\n" remaining))
-
-                   (next-cmd))]
+                 (let ([mime (car (string-split meta ";"))])
+                   (cond
+                     [(string=? mime "text/gemini")
+                      (handle-gmi url c-in)]
+                     [else
+                      (printf "unsupported mime type: ~a~n" mime)]))]
 
                 ;; 30-39 REDIRECT
                 [(and (>= status 30)
                       (<= status 39))
                  (if (> depth 5)
                      (displayln "WARNING: maximum redirection depth exceeded")
-                     (iter (string->url header) (sub1 depth)))]
+                     (iter (string->url meta) (sub1 depth)))]
 
                 ;; 40-49 TEMPORARY FAILURE
                 [(and (>= status 40)