{"id":1549,"date":"2025-06-27T13:03:54","date_gmt":"2025-06-27T13:03:54","guid":{"rendered":"https:\/\/www.cmarix.com\/qanda\/?p=1549"},"modified":"2026-02-05T12:00:47","modified_gmt":"2026-02-05T12:00:47","slug":"how-to-inject-services-in-blazor-custom-httpclients","status":"publish","type":"post","link":"https:\/\/www.cmarix.com\/qanda\/how-to-inject-services-in-blazor-custom-httpclients\/","title":{"rendered":"How Do You Inject Services into a Custom HttpClient in Blazor?"},"content":{"rendered":"\n<p>Injecting services into a custom HttpClient is a common practice in Blazor applications, especially when dealing with secure API calls, logging, or request customization. For example, in a blog platform, API requests might need authentication tokens, custom headers, or logging\u2014all of which can be managed through a custom HttpClient service.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Inject Services into a Custom HttpClient?<\/h2>\n\n\n\n<p><strong>In real-world Blazor apps, API calls often need to:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Include a JWT or session token for authentication<\/li>\n\n\n\n<li>Log outgoing requests or responses<\/li>\n\n\n\n<li>Set custom headers like X-Blog-App<\/li>\n\n\n\n<li>Handle retry logic or transient faults<\/li>\n<\/ul>\n\n\n\n<p>To achieve this cleanly, you can wrap HttpClient inside a custom service and inject any needed dependencies, like a token provider or logger.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Inject Services in Blazor Custom HttpClients?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Create a BlogApiClient Service<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>using System.Net.Http.Headers;\nusing System.Net.Http.Json;\nusing BlogExample.Models;\n\npublic class BlogApiClient\n{\n    private readonly HttpClient _httpClient;\n    private readonly ITokenService _tokenService;\n\n    public BlogApiClient(HttpClient httpClient, ITokenService tokenService)\n    {\n        _httpClient = httpClient;\n        _tokenService = tokenService;\n    }\n\n    public async Task&lt;List&lt;BlogPost>> GetAllPostsAsync()\n    {\n        var token = await _tokenService.GetTokenAsync();\n        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(\"Bearer\", token);\n\n        return await _httpClient.GetFromJsonAsync&lt;List&lt;BlogPost>>(\"api\/blogposts\");\n    }\n\n    public async Task&lt;HttpResponseMessage> CreatePostAsync(BlogPost post)\n    {\n        var token = await _tokenService.GetTokenAsync();\n        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(\"Bearer\", token);\n\n        return await _httpClient.PostAsJsonAsync(\"api\/blogposts\", post);\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Create a Token Service<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public interface ITokenService\n{\n    Task&lt;string> GetTokenAsync();\n}\n\npublic class FakeTokenService : ITokenService\n{\n    public Task&lt;string> GetTokenAsync()\n    {\n        \/\/ Simulated token, replace with real implementation\n        return Task.FromResult(\"your-fake-jwt-token-here\");\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Register Services in Program.cs<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>builder.Services.AddScoped&lt;ITokenService, FakeTokenService>();\n\nbuilder.Services.AddHttpClient&lt;BlogApiClient>(client =>\n{\n    client.BaseAddress = new Uri(\"https:\/\/your-api-base-url.com\/\");\n});<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Use BlogApiClient in a Razor Component<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>@inject BlogApiClient ApiClient\n\n&lt;h3>All Blog Posts&lt;\/h3>\n\n@if (posts == null)\n{\n    &lt;p>&lt;em>Loading...&lt;\/em>&lt;\/p>\n}\nelse\n{\n    &lt;ul class=\"list-group\">\n        @foreach (var post in posts)\n        {\n            &lt;li class=\"list-group-item\">\n                &lt;strong>@post.Title&lt;\/strong>&lt;br \/>\n                @post.Content.Substring(0, Math.Min(post.Content.Length, 100))...\n            &lt;\/li>\n        }\n    &lt;\/ul>\n}\n\n@code {\n    private List&lt;BlogPost> posts;\n\n    protected override async Task OnInitializedAsync()\n    {\n        posts = await ApiClient.GetAllPostsAsync();\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>By creating a custom HttpClient wrapper and injecting services like a token provider, you can build cleaner, more testable Blazor components. This approach also keeps your API logic centralized and consistent across the app. Whether you&#8217;re building a blog platform or an enterprise dashboard, this pattern scales well for real-world use cases.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Injecting services into a custom HttpClient is a common practice in Blazor applications, especially when dealing with secure API calls, logging, or request customization. For example, in a blog platform, API requests might need authentication tokens, custom headers, or logging\u2014all of which can be managed through a custom HttpClient service. Why Inject Services into a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1550,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4,3],"tags":[],"class_list":["post-1549","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dot-net","category-web"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1549","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/comments?post=1549"}],"version-history":[{"count":2,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1549\/revisions"}],"predecessor-version":[{"id":1553,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/posts\/1549\/revisions\/1553"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/media\/1550"}],"wp:attachment":[{"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/media?parent=1549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/categories?post=1549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cmarix.com\/qanda\/wp-json\/wp\/v2\/tags?post=1549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}