diff --git a/contributors.yml b/contributors.yml
index 0b39965f86..42d874c525 100644
--- a/contributors.yml
+++ b/contributors.yml
@@ -89,6 +89,7 @@
 - latin-1
 - lequangdongg
 - liuhanqu
+- lkwr
 - lopezac
 - lordofthecactus
 - loun4
diff --git a/packages/router/__tests__/router-test.ts b/packages/router/__tests__/router-test.ts
index fa18d8c0b7..a91a441260 100644
--- a/packages/router/__tests__/router-test.ts
+++ b/packages/router/__tests__/router-test.ts
@@ -10673,6 +10673,8 @@ describe("a router", () => {
           "https://remix.run/blog",
           "//remix.run/blog",
           "app://whatever",
+          "mailto:hello@remix.run",
+          "web+remix:whatever",
         ];
 
         for (let url of urls) {
diff --git a/packages/router/router.ts b/packages/router/router.ts
index bf8b979da9..81f215ff7e 100644
--- a/packages/router/router.ts
+++ b/packages/router/router.ts
@@ -2683,8 +2683,7 @@ async function callLoaderOrAction(
         "Redirects returned/thrown from loaders/actions must have a Location header"
       );
 
-      let isAbsolute =
-        /^[a-z+]+:\/\//i.test(location) || location.startsWith("//");
+      let isAbsolute = /^(?:[a-z][a-z0-9+.-]*:|\/\/)/i.test(location);
 
       // Support relative routing in internal redirects
       if (!isAbsolute) {