我在使用 HttpClientFactory 时遇到了问题。我需要从一个第三方 Web api 调用两个 Web 方法。
- 获取订单号。
- 获取运输标签文件。
调用 #2 取决于 #1 的结果，因为它需要将 orderNumber 传递给它，例如：
await _client.getAsync("http://xxx/api/getLabel?orderNumber=[returnedOrderNumber]&fileType=1")
当我设置断点和调试时，它按预期工作。没有调试模式，#2 web 方法总是失败。我做过调查。如果我传递静态查询参数，例如：
http://xxx/api/getLabel?orderNumber=123&fileType=1
它工作正常。似乎 #2 在 orderNumber 给它之前评估查询字符串并执行 api 调用。非常令人沮丧，请您对这个问题有所了解吗？
在控制器上：
private readonly ISite1AuthHttpClient _site1HttpClient;
public OrderShippingOrdersController(site1AuthHttpClient)
{
_site1HttpClient=site1AuthHttpClient
}
[HttpGet("{id}")]
public async Task<IActionResult> GetShippingLabel(int id)
{
string token=await _site1HttpClient.GetToken(username.ToString(),password);
string orderNumber=await _site1HttpClient.CreateOrder(Order,token);
if (orderNumber!=null && orderNumber!="")
{
//this API call always failed during runtime. It works on debugging mode.
var streamFile=(MemoryStream)(await _site1HttpClient.getShippingLabel(orderNumber,token));
}
}
HttpClient 类型类：
public interface ISite1HttpClient
{
Task<string> CreateOrder(AueCreateOrder order,string token);
Task<Stream> GetShippingLabel(string orderNumber,string token);
}
public class Site1HttpClient:ISite1HttpClient
{
private readonly HttpClient _client;
public Site1HttpClient(HttpClient httpClient)
{
httpClient.BaseAddress = new Uri("http://abcapi.Site1.com/");
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));
_client = httpClient;
}
public async Task<string> CreateOrder(AbcCreateOrder order,string token)
{
var jsonInString=JsonConvert.SerializeObject(order);
jsonInString="[ " + jsonInString + " ]";
_client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",token);
HttpResponseMessage response = await _client.PostAsync(
"api/AgentShipmentOrder/Create", new StringContent(jsonInString, Encoding.UTF8, "application/json"));
if (response.IsSuccessStatusCode)
{
var contents = await response.Content.ReadAsStringAsync();
AbcOrderCreateResponse abcRes = JsonConvert.DeserializeObject<AbcOrderCreateResponse>(contents);
return abcRes.Message;
}
else
{
var errorResponse = await response.Content.ReadAsStringAsync();
throw new Exception(errorResponse);
}
}
public async Task<Stream> GetShippingLabel(string orderNumber,string token)
{
_client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",token);
HttpResponseMessage response = await _client.GetAsync("api/GetOrderLabel?orderId="+orderNumber+"&fileType=1");
if (response.IsSuccessStatusCode)
{
Stream streamFile= await response.Content.ReadAsStreamAsync();
return streamFile;
}
else
{
throw new Exception("failed to get label.");
}
}
}