How do you enable CORS in a Blazor Server application?
CORS stands for cross-origin resource sharing, and it is an HTTP header-based mechanism that allows the server to tell the browser whether to accept a request from a domain, port, or scheme other than its own. It is based on a process in which the browser sends a “preflight” request to the server, and the server responds with response headers indicating whether the request can proceed or not. The browser will either succeed or fail the request based on what these headers say. The browser sends headers that indicate the HTTP method and headers that will be used in the actual request in the preflight request. To enable CORS in your Blazor Server application, follow these steps: Create a new Blazor Server application with latest .Net support. After creating the application, open the Program.cs file. In this file, you will find the code where the AddCors method is called on the builder.Services object to register the CORS service. Within the AddCors method, a named CORS policy called “NewPolicy” is defined using the options.AddPolicy method. If necessary, you can further configure the CORS policy by providing additional options through the builder parameter in the AddPolicy method. [Program.cs] …builder.Services.AddCors(options => { options.AddPolicy(“NewPolicy”, builder => builder.AllowAnyOrigin() .AllowAnyMethod() .AllowAnyHeader());});…app.UseRouting(); app.UseCors(“NewPolicy”);app.UseAuthorization(); AllowAnyOrigin—Allows access from any origin. AllowAnyMethod—Access to allow any method. AllowAnyHeader—Access to allow any header in a request. Note: Call the UseCors method between the UseRouting and UseAuthorization methods.
How do you bundle and minify the CSS and JS files in Blazor applications?
Bundling is the process of combining multiple files into a single file. Minifying is the process of removing unnecessary data such as comments and extra spaces, as well as converting a large variable name into a smaller name without affecting its functionalities. To bundle and minify the CSS and JS files in a Blazor application, follow these steps: Install the BuildBundlerMinifier NuGet package and reference it in the .csproj file, as shown. [.csproj] <Project Sdk=”Microsoft.NET.Sdk.Web”> …………… <ItemGroup> <PackageReference Include=”BuildBundlerMinifier” Version=”3.2.449″ /> …………… </ItemGroup> </Project> Create a new .json file named bundleconfig.json and add the following code to bundle and minify the CSS and JS files. [bundleconfig.json] [ { “outputFileName”: “wwwroot/css/bundle.min.css”, “inputFiles”: [ “wwwroot/css/app.css”, “wwwroot/css/site.css” ] }, { “outputFileName”: “wwwroot/scripts/bundle.min.js”, “inputFiles”: [ “wwwroot/scripts/core.js”, “wwwroot/scripts/index.js” ], “minify”: { “enabled”: true, “renameLocals”: true }, “sourceMap”: false } ] After you build your application, the bundled and minified files are generated as shown in the following image. You can reference these files in your application based on the requirement. View Sample in GitHub
What is the purpose of the “AddDefaultPolicy” and “AddPolicy” methods in the CORS configuration?
The AddDefaultPolicy method allows you to add a new policy to the CORS configuration and make it the application’s default. In the Program.cs file, you can call the AddCors method to add the cross-origin resource sharing services to the service collection. To add a default policy to the configuration, you can call the AddDefaultPolicy within the AddCors method. Since you are using the default policy, there is no need to include the policy name in the UseCors method, as shown. [Program.cs] The AddPolicy method allows you to add a custom policy to the CORS configuration and give it a name for identification. In the Program.cs file, to add a user-defined (custom) policy to the configuration, you can call AddPolicy within the AddCors method. [Program.cs] Then, you should call the UseCors method and pass the user-defined (custom) policy name to add the CORS middleware to the application pipeline. [Progaram.cs] Note: Call the UseCors method between the UseRouting and UseAuthorization methods.
How do you create an SEO-friendly Blazor WebAssembly application?
SEO is an abbreviation for search-engine optimization, and it refers to the process of optimizing a website for search engines. In simpler words, it refers to the process of improving your website in order to increase its visibility when people use Google, Bing, and other search engines to find what they’re looking for. The best way to make your Blazor WebAssembly application SEO-friendly is to work on the title, meta description, and H1 tag in the index.html common page or in individual pages based on your requirements and development activities. If you include keywords in the title, meta description, and H1 tag of your Blazor WebAssembly application, the app will appear near the top of search engine results when people search for general information using those keywords. Title: The title must be text-only and appears in the browser’s title bar or in the page’s tab. H1 tag: The H1 tag will be displayed as the application’s top-level heading. Meta description: The meta description will be displayed as compressed content just below the search-related link. Meta keywords: If anyone searches for a keyword mentioned in your Blazor application, it will appear at the top of the search engine results. However, Googlebot no longer considers meta keywords to be SEO-friendly. Note: Make sure that your title, H1 tag, and meta description are unique. If the description or title is too long, Google will limit the content to a specific range. Follow these guidelines to avoid unwanted content loss: Title: should be between 20 and 70 characters long. Meta description: should be between 100 and 160 characters long. H1: should be between 20 and 70 characters long.
How do you create an SEO-friendly Blazor Server application?
SEO is an abbreviation for search-engine optimization, and it refers to the process of optimizing a website for search engines. In simpler words, it refers to the process of improving your website in order to increase its visibility when people use Google, Bing, and other search engines to find what they’re looking for. The best way to make your Blazor Server application SEO-friendly is to work on the title, meta description, and H1 tag in the _Host.cshtml common page or in individual pages based on your requirements and development activities. If you include keywords in the title, meta description, and H1 tag of your Blazor Server application, the app will appear near the top of search engine results when people search for general information using those keywords. Title: The title must be text-only and appears in the browser’s title bar or in the page’s tab. H1 tag: The H1 tag will be displayed as the application’s top-level heading. Meta description: The meta description will be displayed as compressed content just below the search-related link. Meta keywords: If anyone searches for a keyword mentioned in your Blazor application, the app will appear at the top of the search engine results. However, Googlebot no longer considers meta keywords to be SEO-friendly. Note: Make sure that your title, H1 tag, and meta description are unique. If the description or title is too long, Google will limit the content to a specific range. Follow these guidelines to avoid unwanted content loss: Title: should be between 20 and 70 characters long. Meta description: should be between 100 and 160 characters long. H1: should be between 20 and 70 characters long.
