feat: handle 'Request path contains unescaped characters' as custom error

Author: srghma

Diff for: src/Affjax.purs

@@ -107,6 +107,7 @@ data Error
   | ResponseBodyError ForeignError (Response Foreign)
   | TimeoutError
   | RequestFailedError
+  | BadUrlError String
   | XHROtherError Exn.Error
 
 printError :: Error -> String
@@ -119,6 +120,8 @@ printError = case _ of
     "There was a problem making the request: timeout"
   RequestFailedError ->
     "There was a problem making the request: request failed"
+  BadUrlError url ->
+    "There was a problem with the url: " <> url
   XHROtherError err ->
     "There was a problem making the request: " <> Exn.message err
 
@@ -215,6 +218,8 @@ request driver req =
           TimeoutError
         else if message == requestFailedMessageIdent then
           RequestFailedError
+        else if message == "Request path contains unescaped characters" then
+          BadUrlError req.url
         else
           XHROtherError err