fix: Use lower-case proxy headers naming (#21235)

Author: allozaur

tools/server/public/bundle.js

@@ -18,7 +18,7 @@
 		<div style="display: contents">
 			<script>
 				{
-					__sveltekit_1snwavw = {
+					__sveltekit_1trm5n9 = {
 						base: new URL('.', location).pathname.slice(0, -1)
 					};
 

tools/server/public/index.html

@@ -35,8 +35,8 @@ static server_http_res_ptr proxy_request(const server_http_req & req, std::strin
     std::map<std::string, std::string> headers;
     for (auto [key, value] : req.headers) {
         auto new_key = key;
-        if (string_starts_with(new_key, "X-Proxy-Header-")) {
-            string_replace_all(new_key, "X-Proxy-Header-", "");
+        if (string_starts_with(new_key, "x-proxy-header-")) {
+            string_replace_all(new_key, "x-proxy-header-", "");
         }
         headers[new_key] = value;
     }

tools/server/server-cors-proxy.h

@@ -28,7 +28,7 @@ export function buildProxiedHeaders(headers: Record<string, string>): Record<str
 	const proxiedHeaders: Record<string, string> = {};
 
 	for (const [key, value] of Object.entries(headers)) {
-		proxiedHeaders[`X-Proxy-Header-${key}`] = value;
+		proxiedHeaders[`x-proxy-header-${key}`] = value;
 	}
 
 	return proxiedHeaders;