From d32eee76274d9c8f7e3c6b690b3de53ff8445e81 Mon Sep 17 00:00:00 2001
From: yhirose <yuji.hirose.bug@gmail.com>
Date: Sun, 30 Sep 2018 08:40:31 -0400
Subject: [PATCH] Fix #96

---
 httplib.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/httplib.h b/httplib.h
index f3115f9..142ae54 100644
--- a/httplib.h
+++ b/httplib.h
@@ -923,10 +923,11 @@ inline std::string encode_url(const std::string& s)
         case ':':  result += "%3A"; break;
         case ';':  result += "%3B"; break;
         default:
-            if (s[i] < 0) {
+            auto c = static_cast<uint8_t>(s[i]);
+            if (c >= 0x80) {
                 result += '%';
                 char hex[4];
-                size_t len = snprintf(hex, sizeof(hex) - 1, "%02X", (unsigned char)s[i]);
+                size_t len = snprintf(hex, sizeof(hex) - 1, "%02X", c);
                 assert(len == 2);
                 result.append(hex, len);
             } else {