fixup! fix(@angular/ssr): decode x-forwarded-prefix before validation

Author: alan-agius4

packages/angular/ssr/src/utils/validation.ts

@@ -284,7 +284,7 @@ function validateHeaders(request: Request): void {
   if (xForwardedPrefix) {
     let xForwardedPrefixDecoded: string;
     try {
-      xForwardedPrefixDecoded = decodeURIComponent(xForwardedPrefix);
+      xForwardedPrefixDecoded = decodeURIComponent(xForwardedPrefix).trim();
     } catch (e) {
       throw new Error(
         'Header "x-forwarded-prefix" contains an invalid value and cannot be decoded.',

packages/angular/ssr/test/utils/validation_spec.ts

@@ -197,6 +197,8 @@ describe('Validation Utils', () => {
         '/foo/..\\bar',
         '.',
         '..',
+        '%2e',
+        '%2e%2e/foo',
       ];
 
       for (const prefix of inputs) {