我正在使用asp.net core mvc开发一个用于在线预订的API。但是,当我尝试从API post方法添加预订时,我收到错误:
WebException:远程服务器返回错误:(415)不支持的媒体类型。 System.Net.HttpWebRequest.GetResponse()
有2个项目:
项目1
我的API动作方法中有一个post方法,即[FromBody]属性。我必须调用此方法并传递预留对象。
方法定义是:
[HttpPost]
public Reservation Post([FromBody] Reservation res) =>
repository.AddReservation(new Reservation
{
Name = res.Name,
FromLocation = res.FromLocation,
ToLocation = res.ToLocation
});
项目2在项目2中,我想调用此API方法。为此,我在视图中创建了一个表单,用于填充名称,从位置到位置值。然后在控制器上我必须调用API方法(如上所述)。
控制器代码是:
[HttpPost]
public IActionResult AddReservation(Reservation reservation)
{
HttpWebRequest apiRequest = WebRequest.Create("http://localhost:8888/api/Reservation") as HttpWebRequest;
apiRequest.Method = "Post";
string parameters = "Name=" + reservation.Name + "Image=" + reservation.Image + "&FromLocation=" + reservation.FromLocation + "&ToLocation=" + reservation.ToLocation;
byte[] byteArray = Encoding.UTF8.GetBytes(parameters);
apiRequest.ContentType = "application/x-www-form-urlencoded";
apiRequest.ContentLength = byteArray.Length;
// Add the post data to the web request
Stream postStream = apiRequest.GetRequestStream();
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
string apiResponse = "";
using (HttpWebResponse response = apiRequest.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(response.GetResponseStream());
apiResponse = reader.ReadToEnd();
}
return RedirectToAction("Index");
}
我收到错误 - WebException:远程服务器返回错误:(415)不支持的媒体类型。 System.Net.HttpWebRequest.GetResponse()
但是当我运行powershell命令时它会工作:
PM> Invoke-RestMethod http://localhost:8888/api/Reservation -Method POST -Body (@{Name="Anne"; ToLocation="Meeting Room 4"} | ConvertTo-Json) -ContentType "application/json"
请帮忙?
您的POST代码中存在两个问题,首先我在评论中提到了Chris和他的回答。
第二个是你如何生成你的请求的主体,使用这样的东西:
var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://url");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{\"user\":\"test\"," +
"\"password\":\"bla\"}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
从这个anwser采取的代码
您也可以使用Json.Net序列化您的预订(如果所有字段名称和类型都匹配)
在前者中,您将请求体编码为x-www-form-urlencoded
,后者编码为application/json
。同样的行动无法对两者做出回应。由于param用[FromBody]
装饰,application/json
是你应该使用的,这就是powershell命令工作的原因。
如果你真的想要x-www-form-urlencoded
,那么删除[FromBody]
属性。如果您确实需要同时支持两者,则需要两条不同的路线:
private Reservation PostCore(Reservation res)
{
// do something
}
[HttpPost("json")]
public Reservation PostJson([FromBody] Reservation res) => PostCore(res);
[HttpPost("")]
public Reservation PostForm(Reservation res) => PostCore(res);