[5.x] Avoid hardcoded nocache url in js (#13199)

Co-authored-by: Jason Varga <jason@pixelfear.com>

Author: JorisOrangeStudio

routes/web.php

@@ -55,7 +55,8 @@
     Route::prefix(config('statamic.routes.action'))
         ->post('nocache', NoCacheController::class)
         ->middleware(NoCacheLocalize::class)
-        ->withoutMiddleware(['App\Http\Middleware\VerifyCsrfToken', 'Illuminate\Foundation\Http\Middleware\VerifyCsrfToken']);
+        ->withoutMiddleware(['App\Http\Middleware\VerifyCsrfToken', 'Illuminate\Foundation\Http\Middleware\VerifyCsrfToken'])
+        ->name('nocache');
 
     if (OAuth::enabled()) {
         Route::get(config('statamic.oauth.routes.login'), [OAuthController::class, 'redirectToProvider'])->name('oauth.login');

src/StaticCaching/Cachers/FileCacher.php

@@ -10,6 +10,7 @@
 use Statamic\Facades\File;
 use Statamic\Facades\Path;
 use Statamic\Facades\Site;
+use Statamic\Facades\URL;
 use Statamic\StaticCaching\Page;
 use Statamic\StaticCaching\Replacers\CsrfTokenReplacer;
 use Statamic\Support\Arr;
@@ -238,6 +239,7 @@ public function setNocacheJs(string $js)
     public function getNocacheJs(): string
     {
         $csrfPlaceholder = CsrfTokenReplacer::REPLACEMENT;
+        $nocacheUrl = URL::makeRelative(route('statamic.nocache'));
 
         $default = <<<EOT
 (function() {
@@ -266,7 +268,7 @@ function replaceElement(el, html) {
 
     var map = createMap();
 
-    fetch('/!/nocache', {
+    fetch('{$nocacheUrl}', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({