1 files changed, 15 insertions, 3 deletions
diff --git a/stdlib/source/lux/world/net/http/header.lux b/stdlib/source/lux/world/net/http/header.lux
index a5dd66748..3a96b37fa 100644
--- a/stdlib/source/lux/world/net/http/header.lux
+++ b/stdlib/source/lux/world/net/http/header.lux
@@ -1,5 +1,7 @@
 (.module:
   [lux #*
+   [control
+    [pipe (#+ case>)]]
    [data
     [text
      format]
@@ -9,14 +11,24 @@
    ["." mime (#+ MIME)]
    [// (#+ URL)]])
 
+(def: #export (add name value)
+  (-> Text Text Header)
+  (dictionary.upsert name ""
+                     (|>> (case>
+                           ""
+                           value
+                           
+                           previous
+                           (format previous "," value)))))
+
 (def: #export content-length
   (-> Nat Header)
-  (|>> %n (dictionary.put "Content-Length")))
+  (|>> %n (..add "Content-Length")))
 
 (def: #export content-type
   (-> MIME Header)
-  (|>> mime.name (dictionary.put "Content-Type")))
+  (|>> mime.name (..add "Content-Type")))
 
 (def: #export location
   (-> URL Header)
-  (dictionary.put "Location"))
+  (..add "Location"))