如何使用HttpClient对单个请求设置HttpHeader [英] How to set HttpHeader on individual request using HttpClient

问题描述

我有一个HttpClient可以在多个线程之间共享:

I have an HttpClient that is shared across multiple threads:

public static class Connection
{
    public static HttpClient Client { get; }

    static Connection()
    {
        Client = new HttpClient
        {
            BaseAddress = new Uri(Config.APIUri)
        };

        Client.DefaultRequestHeaders.Add("Connection", "Keep-Alive");
        Client.DefaultRequestHeaders.Add("Keep-Alive", "timeout=600");
        Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    }
}

我在每个请求中都添加了一些默认标头.但是，当我使用它时，我想为请求的 just 添加标题:

It has some default headers I put onto each request. However, when I use it, I want to add on a header for just that request:

var client = Connection.Client;
StringContent httpContent = new StringContent(myQueueItem, Encoding.UTF8, "application/json");

httpContent.Headers.Add("Authorization", "Bearer " + accessToken); // <-- Header for this and only this request
HttpResponseMessage response = await client.PostAsync("/api/devices/data", httpContent);
response.EnsureSuccessStatusCode();

string json = await response.Content.ReadAsStringAsync();

执行此操作时，出现异常:

When I do this, I get the exception:

{标头名称滥用.请确保请求标头与 HttpRequestMessage，带有HttpResponseMessage的响应标头和 带有HttpContent对象的内容标题.}

{"Misused header name. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects."}

我找不到其他方法向此请求添加请求标头.如果在Client上修改DefaultRequestHeaders，则会遇到线程问题，并且必须实施各种疯狂的锁定.

I couldn't find another way to add request headers to this request. If I modify the DefaultRequestHeaders on Client, I run into thread issues and would have to implement all sorts of crazy locking.

有什么想法吗?

推荐答案

您可以使用在消息中，您可以设置 uri ，

In the message you can setup the uri, method, content and headers.

示例:

HttpRequestMessage msg = new HttpRequestMessage(HttpMethod.Post, "/api/devices/data");
msg.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
msg.Content = new StringContent(myQueueItem, Encoding.UTF8, "application/json");

HttpResponseMessage response = await client.SendAsync(msg);
response.EnsureSuccessStatusCode();

string json = await response.Content.ReadAsStringAsync();

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