c# - 调用 Ebay API 时，Content-Language header 会抛出 Misused header name 错误

Question

当我使用 Ebay API 向 CreateOrReplaceInventoryItem 发出 PUT 请求时，出现以下错误:

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

下面的代码会引发错误。

using (var client = new HttpClient())
{
    var baseUri = new Uri(string.Format("https://api.sandbox.ebay.com/sell/inventory/v1/inventory_item/{0}", SKU));
    client.DefaultRequestHeaders.Add("Authorization", string.Format("Bearer {0}", token));
    client.DefaultRequestHeaders.Add("Content-Language", "en-US");

    var payload = JsonConvert.SerializeObject(product);
    var content = new StringContent(payload, Encoding.UTF8, "application/json");

    var response = client.PutAsync(baseUri, content).Result;
    return response.Content.ReadAsStringAsync().Result;
}

如果我删除该行:

client.DefaultRequestHeaders.Add("Content-Language", "en-US");

然后我得到一个返回的错误对象:

errors":[{"errorId":25709,"domain":"API_INVENTORY","subdomain":"Selling","category":"REQUEST","message":"Invalid value for header Content-Language."}]} 

我做错了什么？还有另一种我不知道的设置 Content-Language 的方法吗？

Answer 1

由于 Content-Language 是一个内容 header ，因此您应该在 HttpContent 实例中分配它，而不是 DefaultRequestHeaders。根据您的代码将是这样的:

using (var client = new HttpClient())
{
    var baseUri = new Uri(string.Format("https://api.sandbox.ebay.com/sell/inventory/v1/inventory_item/{0}", SKU));
    client.DefaultRequestHeaders.Add("Authorization", string.Format("Bearer {0}", token));

    var payload = JsonConvert.SerializeObject(product);
    var content = new StringContent(payload, Encoding.UTF8, "application/json");
    content.Headers.Add("Content-Language", "en-US");

    var response = client.PutAsync(baseUri, content).Result;
    return response.Content.ReadAsStringAsync().Result;
}