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[英]No response with POST request and Content-Type “application/json” in flask
[英]Send a POST request of JSON content-type and display JSON response in VB.NET
我正在嘗試將POST請求發送到shapeshift,該請求幾乎沒有要作為JSON發送的參數,然后希望在VB.NET中顯示部分響應
shapeshift的文檔: https : //info.shapeshift.io/api#api-9
以下是我到目前為止嘗試過的方法:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim request As HttpWebRequest
Dim response As HttpWebResponse
Dim reader As StreamReader
Dim rawresponse As String
Try
request = DirectCast(WebRequest.Create("https://shapeshift.io/sendamount"), HttpWebRequest)
request.ContentType = "application/json"
request.Method = "POST"
Dim postdata As String = "{""amount"":}" + TextBox1.Text + "{,""withdrawal"":}" + TextBox2.Text + "{,""pair"":""btc_eth""}" + "{,""returnAddress"":}" + TextBox3.Text
request.ContentLength = postdata.Length
Dim requestWriter As StreamWriter = New StreamWriter(request.GetRequestStream())
requestWriter.Write(postdata)
requestWriter.Close()
response = DirectCast(request.GetResponse(), HttpWebResponse)
reader = New StreamReader(response.GetResponseStream())
rawresponse = reader.ReadToEnd()
Catch ex As Exception
Console.WriteLine(ex.ToString)
End Try
Dim json As String = rawresponse
Dim jsonObject As Newtonsoft.Json.Linq.JObject = Newtonsoft.Json.Linq.JObject.Parse(json)
Label1.Text = jsonObject("expiration").ToString
End Sub
我得到的錯誤是:400錯誤的請求
我認為是因為我弄亂了解釋JSON POST請求的代碼中的某些內容。 我做了很多研究,嘗試了幾件事,但沒有任何效果:(
嘗試以下方法:
Dim postdata As String = "{""amount"":" + TextBox1.Text + "},{""withdrawal"":""" + TextBox2.Text + """},{""pair"":""btc_eth""},{""returnAddress"":""" + TextBox3.Text + """}"
您的數據格式不正確。
或者這是String.Format的另一個版本:
Dim postdata2 As String = String.Format("{{""amount"":{0}}},{{""withdrawal"":""{1}""}},{{""pair"":""btc_eth""}},{{""returnAddress"":""{2}""}}", TextBox1.Text, TextBox2.Text, TextBox3.Text)
WebRequest現在已經很老了。 您可能要使用較新的System.Net.Http.HttpClient, 此處是官方文檔。
另外,在轉換為Json時,我強烈建議使用帶有通用參數(Of ...)的Newtonsoft.Json nuget包的JConvert / Deserialize功能轉換為預定義的對象。 在返回時節省大量手動文本解析。
舉了一個簡單的例子:
Private async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim transaction As New MyRequestData With
{
.Amount = Convert.ToDecimal(TextBox1.Text),
.Withdrawal = Convert.ToDecimal(TextBox2.Text),
.ReturnAddress = TextBox3.Text
}
Dim content = newtonsoft.Json.JsonConvert.SerializeObject(transaction)
dim buffer = System.Text.Encoding.UTF8.GetBytes(content)
Dim bytes = new Net.Http.ByteArrayContent(buffer)
bytes.Headers.ContentType = new Net.Http.Headers.MediaTypeHeaderValue("application/json")
Dim responseBody As string = nothing
Using client As New System.Net.Http.HttpClient
Dim response = Await client.PostAsync("https://shapeshift.io/sendamount",bytes)
responsebody = Await response.Content.ReadAsStringAsync()
End Using
Dim data = Newtonsoft.Json.JsonConvert.DeserializeObject(Of MyResponseData)(responsebody)
If data.Expiration Is Nothing
Label1.Text = data.Error
Else
Label1.Text = data.Expiration
End If
End Sub
Public class MyRequestData
Public property Amount As Decimal
Public property Withdrawal As Decimal
Public property Pair As String = "btc_eth"
Public property ReturnAddress As String
End Class
Public class MyResponseData
Public property Expiration As String
Public property [Error] As String
End Class
希望這有幫助,祝你好運!
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