C# 如何修复 400 Bad Request 错误？
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How to fix 400 Bad Request error?
提问by Trey Copeland
I'm getting a The remote server returned an error: (400) Bad Requesterror when trying to run my code. Any help would be appreciated. Thanks.
我收到远程服务器返回错误：(400)尝试运行我的代码时出现错误请求错误。任何帮助，将不胜感激。谢谢。
// Open request and set post data
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("myurl.com/restservice/Login");
request.Method = "POST";
request.ContentType = "application/json; charset:utf-8";
string postData = "{ \"username\": \"testname\" },{ \"password\": \"testpass\" }";
// Write postData to request url
using (Stream s = request.GetRequestStream())
{
using (StreamWriter sw = new StreamWriter(s))
sw.Write(postData);
}
// Get response and read it
using (Stream s = request.GetResponse().GetResponseStream()) // error happens here
{
using (StreamReader sr = new StreamReader(s))
{
var jsonData = sr.ReadToEnd();
}
}
JSON EDIT
JSON 编辑
Changed to:
变成：
{ \"username\": \"jeff\", \"password\": \"welcome\" }
But still not working.
但仍然无法正常工作。
EDIT
编辑
This is what I found that works:
这是我发现有效的方法：
// Open request and set post data
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("myurl.com/restservice/Login");
request.Method = "POST";
request.ContentType = "application/json";
string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }";
// Set postData to byte type and set content length
byte[] postBytes = System.Text.UTF8Encoding.UTF8.GetBytes(postData);
request.ContentLength = postBytes.Length;
// Write postBytes to request stream
Stream s = request.GetRequestStream();
s.Write(postBytes, 0, postBytes.Length);
s.Close();
// Get the reponse
WebResponse response = request.GetResponse();
// Status for debugging
string ResponseStatus = (((HttpWebResponse)response).StatusDescription);
// Get the content from server and read it from the stream
s = response.GetResponseStream();
StreamReader reader = new StreamReader(s);
string responseFromServer = reader.ReadToEnd();
// Clean up and close
reader.Close();
s.Close();
response.Close();
采纳答案by jorgehmv
can you try string postData = "[{ \"username\": \"testname\" },{ \"password\": \"testpass\" }]";
你能试一下吗 string postData = "[{ \"username\": \"testname\" },{ \"password\": \"testpass\" }]";
That way you are sending an array of 2 objects
这样你就发送了一个包含 2 个对象的数组
Edit: Also maybe what you really want to send is just an object with 2 properties, then it would be string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }"
编辑：也许你真正想要发送的只是一个具有 2 个属性的对象，那么它就是string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }"
回答by rastating
It looks as though it may be coming from the JSON you are posting as it is invalid, see below what you are sending but in a valid form:
看起来它可能来自您发布的 JSON，因为它无效，请参阅下面您发送的内容，但格式有效：
{
"username": "testname",
"password": "testpass"
}
回答by L.B
postData is not a valid Json object
postData 不是有效的 Json 对象
{ "username": "testname" },{ "password": "testpass" }
Try to use a Json parser like Json.Net, JavaScriptSerializeror DataContractJsonSerializerinstead of forming it manually
尝试使用 Json 解析器，如Json.Net、JavaScriptSerializer或DataContractJsonSerializer而不是手动形成它
