6.3IHttpContentProcessorFactory Content Processor Factory

Created on Aug 17, 2026~3 min read

The IHttpContentProcessorFactory content processor factory is responsible for determining the appropriate IHttpContentProcessor content processor based on the content and type of the raw request, and calling its Process method to generate an HttpContent instance. The factory service is configured as a singleton to ensure its uniqueness and stability throughout the application lifecycle.

If no suitable IHttpContentProcessor content processor is found, an InvalidOperationException is thrown, with the following exception message:

bash
No processor found that can handle the content type `application/pdf` and the provided raw content of type `System.Span`1[T]`. Please ensure that the correct content type is specified and that a suitable processor is registered.

The following is an example combining the IHttpContentProcessorFactory content processor factory with HttpClient, showing how to easily build the appropriate HttpContent content via its Build method. As explained in the previous sections, when the content type is application/json, the StringContentProcessor processor is used and a StringContent instance is generated.

cs
public class YourService(IHttpContentProcessorFactory httpContentProcessorFactory)  // .NET8+ supports primary constructor injection{    public async Task<string> GetStringAsync()    {        var httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, "https://furion.net/");        // Call the Build method to build an HttpContent instance; the concrete instance type is StringContent        var httpContent = httpContentProcessorFactory.Build(new HttpContentProcessorContext(new { id = 1, name = "Furion" }, "application/json"));        httpRequestMessage.Content = httpContent;        using var httpClient = new HttpClient();        var httpResponseMessage = await httpClient.SendAsync(httpRequestMessage);        return await httpResponseMessage.Content.ReadAsStringAsync();    }}