How to enforce lowercase routing in ASP.NET Core?

How to enforce lowercase routing in ASP.NET Core?

To enforce lowercase routing in ASP.NET Core, you can create a custom IRouteConstraint and add it to your route configuration. Here's an example:

  • Create a class that implements IRouteConstraint:
public class LowercaseRouteConstraint : IRouteConstraint { public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection) { if (values.TryGetValue(routeKey, out var routeValue)) { var value = Convert.ToString(routeValue, CultureInfo.InvariantCulture); return value.Equals(value.ToLowerInvariant()); } return true; } }
  • Register the LowercaseRouteConstraint in your application's Startup.cs file:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { // ... app.UseRouting(); app.UseEndpoints(endpoints => { endpoints.MapControllers().RequireAuthorization(); // register lowercase route constraint endpoints.MapControllerRoute( name: "default", pattern: "{controller}/{action}/{id?}", defaults: new { controller = "Home", action = "Index" }, constraints: new { id = new LowercaseRouteConstraint() } ); }); // ... }

Now, any requests that have uppercase letters in the id route parameter will return a 404 error.

Examples

  1. "Enforce lowercase routing in ASP.NET Core MVC"

    • Description: Enforcing lowercase routing in ASP.NET Core MVC ensures uniformity in URLs and improves SEO.
    public void ConfigureServices(IServiceCollection services) { services.AddRouting(options => options.LowercaseUrls = true); }
    • Description: This code configures ASP.NET Core MVC to enforce lowercase URLs by setting the LowercaseUrls option to true in the routing configuration.

  2. "How to make ASP.NET Core routing case-insensitive"

    • Description: Making ASP.NET Core routing case-insensitive ensures that routing matches are not affected by the casing of URLs.
    public void ConfigureServices(IServiceCollection services) { services.AddRouting(options => options.LowercaseQueryStrings = true); }
    • Description: This code snippet demonstrates how to configure ASP.NET Core routing to make query strings lowercase, ensuring case-insensitive routing.

  3. "Configure ASP.NET Core routing to enforce lowercase URLs"

    • Description: Configuring ASP.NET Core routing to enforce lowercase URLs improves consistency and readability of URLs.
    public void ConfigureServices(IServiceCollection services) { services.AddRouting(options => { options.LowercaseUrls = true; options.AppendTrailingSlash = true; // Optional: Append trailing slash for consistency }); }
    • Description: This code illustrates how to configure ASP.NET Core routing to enforce lowercase URLs and optionally append trailing slashes for consistency.

  4. "ASP.NET Core lowercase URL routing middleware"

    • Description: Implementing a custom middleware for ASP.NET Core to enforce lowercase URL routing provides fine-grained control over URL casing.
    public class LowercaseRoutingMiddleware { private readonly RequestDelegate _next; public LowercaseRoutingMiddleware(RequestDelegate next) { _next = next; } public async Task Invoke(HttpContext context) { context.Request.Path = context.Request.Path.ToString().ToLower(); await _next(context); } }
    • Description: This code defines a custom middleware for ASP.NET Core that converts incoming request paths to lowercase, ensuring lowercase routing.

  5. "ASP.NET Core route constraint for lowercase URLs"

    • Description: Implementing a route constraint in ASP.NET Core ensures that specific route parameters are enforced to be lowercase.
    public class LowercaseRouteConstraint : IRouteConstraint { public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection) { var value = values[routeKey]?.ToString(); return value != null && value.ToLower() == value; } }
    • Description: This code defines a route constraint in ASP.NET Core that ensures the value of a route parameter is lowercase.

  6. "Enforce lowercase URL routing in ASP.NET Core Razor Pages"

    • Description: Enforcing lowercase URL routing in ASP.NET Core Razor Pages maintains URL consistency and SEO best practices.
    public void ConfigureServices(IServiceCollection services) { services.AddRazorPages(options => options.Conventions.Add(new LowercaseRouteConvention())); }
    • Description: This code configures ASP.NET Core Razor Pages to enforce lowercase routing by adding a custom convention that converts routes to lowercase.

  7. "ASP.NET Core MVC attribute for lowercase routing"

    • Description: Utilizing a custom attribute in ASP.NET Core MVC enables developers to annotate controllers or actions to enforce lowercase routing.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)] public class LowercaseRouteAttribute : Attribute, IActionModelConvention { public void Apply(ActionModel action) { foreach (var selector in action.Selectors) { selector.AttributeRouteModel.Template = selector.AttributeRouteModel.Template.ToLower(); } } }
    • Description: This code defines a custom attribute in ASP.NET Core MVC that converts route templates to lowercase, enforcing lowercase routing for annotated controllers or actions.

  8. "ASP.NET Core lowercase URL routing convention"

    • Description: Implementing a custom routing convention in ASP.NET Core allows for centralized control over URL casing.
    public class LowercaseRouteConvention : IPageRouteModelConvention { public void Apply(PageRouteModel model) { foreach (var selector in model.Selectors) { selector.AttributeRouteModel.Template = selector.AttributeRouteModel.Template.ToLower(); } } }
    • Description: This code defines a custom routing convention in ASP.NET Core that converts route templates for Razor Pages to lowercase.

  9. "How to lowercase ASP.NET Core route parameters"

    • Description: Lowercasing ASP.NET Core route parameters ensures uniformity and consistency in URL casing.
    public class Startup { public void ConfigureServices(IServiceCollection services) { services.AddRouting(options => { options.ConstraintMap["lowercase"] = typeof(LowercaseRouteConstraint); }); } }
    • Description: This code configures ASP.NET Core routing to utilize a custom route constraint for lowercasing route parameters.

  10. "Convert ASP.NET Core route templates to lowercase"

    • Description: Converting ASP.NET Core route templates to lowercase using a custom convention ensures consistent URL casing throughout the application.
    public class LowercaseRouteConvention : IActionModelConvention { public void Apply(ActionModel action) { foreach (var selector in action.Selectors) { selector.AttributeRouteModel.Template = selector.AttributeRouteModel.Template.ToLower(); } } }
    • Description: This code defines a custom convention in ASP.NET Core MVC that converts route templates to lowercase, ensuring consistent URL casing for annotated actions.

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