Core: use uppercase hexadecimal digits for percent-encoding.
RFC3986 says that, for consistency, URI producers and normalizers
should use uppercase hexadecimal digits for all percent-encodings.
This is also what modern web browsers and other tools use.
Using lowercase hexadecimal digits makes it harder to interact with
those tools in case when use of the percent-encoded URI is required,
for example when $request_uri is part of the cache key.
Signed-off-by: Piotr Sikora <piotr@cloudflare.com>
diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index 4e27917..9d854fa 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -1407,7 +1407,7 @@
{
ngx_uint_t n;
uint32_t *escape;
- static u_char hex[] = "0123456789abcdef";
+ static u_char hex[] = "0123456789ABCDEF";
/* " ", "#", "%", "?", %00-%1F, %7F-%FF */
