From 6544d0dc7762b3ddf5d59db68629f2bd4a55650f Mon Sep 17 00:00:00 2001
From: Fuwn <contact@fuwn.me>
Date: Tue, 8 Jul 2025 05:30:21 +0000
Subject: feat(router): Add case-insensitive route matching option

---
 examples/fix_path.rs | 7 +++++--
 src/router.rs        | 8 ++++++++
 src/router_option.rs | 3 +++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/examples/fix_path.rs b/examples/fix_path.rs
index 6ea8f9e..f0be8f7 100644
--- a/examples/fix_path.rs
+++ b/examples/fix_path.rs
@@ -17,14 +17,17 @@
 
 //! `cargo run --example fix_path --features response-macros`
 
+use windmark::router_option::RouterOption;
+
 #[windmark::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
   windmark::router::Router::new()
     .set_private_key_file("windmark_private.pem")
     .set_certificate_file("windmark_public.pem")
     .add_options(&[
-      windmark::router_option::RouterOption::RemoveExtraTrailingSlash,
-      windmark::router_option::RouterOption::AddMissingTrailingSlash,
+      RouterOption::RemoveExtraTrailingSlash,
+      RouterOption::AddMissingTrailingSlash,
+      RouterOption::AllowCaseInsensitiveLookup,
     ])
     .mount(
       "/close",
diff --git a/src/router.rs b/src/router.rs
index 6ae33b0..81eb6c4 100644
--- a/src/router.rs
+++ b/src/router.rs
@@ -421,6 +421,14 @@ impl Router {
     }
 
     let mut path = url.path().to_string();
+
+    if self
+      .options
+      .contains(&RouterOption::AllowCaseInsensitiveLookup)
+    {
+      path = path.to_lowercase();
+    }
+
     let mut route = self.routes.at(&path);
 
     if route.is_err() {
diff --git a/src/router_option.rs b/src/router_option.rs
index 62ecb47..a28ba6f 100644
--- a/src/router_option.rs
+++ b/src/router_option.rs
@@ -7,4 +7,7 @@ pub enum RouterOption {
   /// If enabled, adds a trailing slash to the request URL path if a route
   /// exists for the path with the slash (e.g., `/foo` becomes `/foo/`).
   AddMissingTrailingSlash,
+  /// If enabled, the router will perform case-insensitive matching for
+  /// incoming request URL paths (e.g., `/foo` will match `/Foo` or `/FOO`).
+  AllowCaseInsensitiveLookup,
 }
-- 
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