C# 如何修复400错误请求错误?
我收到一个错误消息,远程服务器在尝试运行我的代码时返回了一个错误:(400)错误请求错误。任何帮助都将不胜感激。谢谢C# 如何修复400错误请求错误?,c#,C#,我收到一个错误消息,远程服务器在尝试运行我的代码时返回了一个错误:(400)错误请求错误。任何帮助都将不胜感激。谢谢 // Open request and set post data HttpWebRequest request = (HttpWebRequest)WebRequest.Create("myurl.com/restservice/Login"); request.Method = "POST"; request.ContentType = "ap
// 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编辑
改为:
{ \"username\": \"jeff\", \"password\": \"welcome\" }
但仍然不起作用
编辑
这就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();
你能试试
string postData=“[{\'username\':\'testname\'},{\'password\':\'testpass\'}]”吗代码>
这样,您将发送一个包含2个对象的数组
编辑:也可能您真正想要发送的只是一个具有2个属性的对象,那么它将是string postData=“{\'username\”:\'testname\,\'password\:\'testpass\“}”
它看起来可能来自您发布的JSON,因为它是无效的,请参阅以下您正在发送但格式有效的内容:
{
"username": "testname",
"password": "testpass"
}
postData不是有效的Json对象
{ "username": "testname" },{ "password": "testpass" }
尝试使用类似Json的解析器,或者不手动生成它为什么要处理流?用一个新的来代替!WebClient是个好主意。但是还要注意,400请求通常表示服务器不理解您的请求。错误的负载可能是罪魁祸首,特别是因为您的JSON似乎不正确。如果数据无效,许多REST服务会返回HTTP 400,例如Viamenete和Palletways。问题可能是postData吗?它看起来像是在按字面意思发送\斜杠。我不认为这会是一个问题,它们只是转义字符。。您在哪里看到这些斜杠被发送?当我将鼠标悬停在postData上时,处于调试模式。好的,调试模式将显示转义字符串,但您可以确保它们在发送时没有斜杠。所以更改json字符串是行不通的?正如我在其他评论中所说,如果数据无效,许多REST服务都会返回HTTP 400,例如Viamenete和Palletways。我今天刚刚使用了一个基于HTTP的web服务,它可以做完全相同的事情。