dotnet core3.1 下使用HttpClient.PostAsync()在服务内部请求第三方服务时注意事项

命名空间

System.Net.Http

Post请求

例：

string url = _userServiceUrl + "api/User/CheckOrCreate?phone=" + phone;
var response = await _httpClient.PostAsync(url, null);

webapi:

public async Task<IActionResult> CheckOrCreate([FromQuery]string phone)
{
    //dosomething...
}

2.如果参数是通过HttpContent发送的单个字符串则webapi中 Controller 的方法需要加上 [FromForm]

例：

var data = new FormUrlEncodedContent(new Dictionary<string, string> {{"phone",phone }});
var response = await _httpClient.PostAsync(url, data);

webapi:

public async Task<IActionResult> CheckOrCreate([FromForm]string phone)
{
    //dosomething...
}

3.如果参数是通过HttpContent发送的JSON则webapi中 Controller 的方法需要加上 [FromBody]

例：

string url = _userServiceUrl + "api/User/CheckOrCreate";
UserInfoDto dto = new UserInfoDto { Name = "Yuan", Phone = phone };
var data = new StringContent(JsonConvert.SerializeObject(dto),Encoding.UTF8,"application/json");

webapi:

public async Task<IActionResult> CheckOrCreate([FromBody]CheckOrCreateAppUserViewModel model)
{
    //dosomething
}

补充

例：

string url = _userServiceUrl + "api/User/CheckOrCreate?phone=" + phone;
var response = await _httpClient.PostAsync(url, null);

webapi:

public async Task<IActionResult> CheckOrCreate([FromUri] XXXModel mode)
{
    //dosomething...
}

注意

控制器内不要声明多个同名不同参且请求方式也一样的控制器,否则会提示匹配多个路由的问题（也有可能是我路由没有配好的原因）