.NET HttpClient 请求内容类型

Question

我不确定，但在我看来，.NET HttpClient 库的默认实现是有缺陷的。看起来它在 PostAsJsonAsync 调用中将 Content-Type 请求值设置为“text/html”。我试图重置请求值，但不确定我是否正确执行此操作。任何建议。

public async Task<string> SendPost(Model model)
{
    var client = new HttpClient();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    var response = await client.PostAsJsonAsync(Url + "api/foo/", model);
    response.EnsureSuccessStatusCode();
    return await response.Content.ReadAsStringAsync();    
}

Answer 1

您应该设置内容类型。使用“接受”，您可以定义您想要的响应。

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html Accept request-header 字段可用于指定响应可接受的某些媒体类型。接受标头可用于指示请求特别限于一小组所需类型，例如对内嵌图像的请求。

public async Task<string> SendPost(Model model)
{
    var client = new HttpClient(); //You should extract this and reuse the same instance multiple times.
    var request = new HttpRequestMessage(HttpMethod.Post, Url + "api/foo");
    using(var content = new StringContent(Serialize(model), Encoding.UTF8, "application/json"))
    {
        request.Content = content;
        var response = await client.SendAsync(request).ConfigureAwait(false);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync().ConfigureAwait(false);
    }
}