From 0eeb8d26f3699d09486424644b0a7205ec43b083 Mon Sep 17 00:00:00 2001
From: Matthew Flatt <mflatt@racket-lang.org>
Date: Thu, 29 Apr 2021 11:33:03 -0600
Subject: [PATCH] net/url: trim whitespace when getting enviornment variables
 like `http_proxy`

For compatibility with other systems, trmi whitespace from environment
variables.

Closes #2663
---
 racket/collects/net/url.rkt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/racket/collects/net/url.rkt b/racket/collects/net/url.rkt
index 665f974750..2da85efdf2 100644
--- a/racket/collects/net/url.rkt
+++ b/racket/collects/net/url.rkt
@@ -44,7 +44,8 @@
 ;; proxied-scheme
 (define (env->c-p-s-entries . envarses)
   (define (in1 proxied-scheme envvar)
-    (match (getenv envvar)
+    (match (let ([s (getenv envvar)])
+             (and s (string-trim s)))
       [#f #f]
       ["" null]
       [(app string->url*