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Forum Discussion
Error 404 Server remote no found
I have an expired token so to get a new one.
I try with this code but i have the error Error 404 Server remote no found.
I use https://api.dropbox.com and https://api.dropboxapi.com with the same result.
Dim _command As String
_command = "https://api.dropboxapi.com/oauth2/token "
_command += " -d grant_type=refresh_token "
_command += "-d refresh_token=" & _refresh_token
_command += "-d client_id=" & _App_key
_command += "-d client_secret=" & _App_secret
Dim Request As HttpWebRequest
Request = HttpWebRequest.Create(_command)
Request.Method = "POST"
Request.KeepAlive = True
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 Or SecurityProtocolType.Tls12 Or SecurityProtocolType.Tls11 Or SecurityProtocolType.Tls
Request.ContentType = "application/json" ' application/x-www-form-urlencoded"
Request.UserAgent = "Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36"
ServicePointManager.SecurityProtocol = CType(48, SecurityProtocolType) Or CType(192, SecurityProtocolType) Or CType(768, SecurityProtocolType) Or CType(3072, SecurityProtocolType)
Request.AllowAutoRedirect = True
Try
Using response = CType(Request.GetResponse(), HttpWebResponse)
Using reader = New IO.StreamReader(response.GetResponseStream())
_file = reader.ReadToEnd()
End Using
End Using
Catch ex As WebException
Using response = CType(ex.Response, HttpWebResponse)
Using reader = New IO.StreamReader(response.GetResponseStream())
_errore = reader.ReadToEnd()
End Using
End Using
Catch ex As Exception
Throw
End Try
Thank you.
Luca
Lukag wrote:I changed my code but i have an error 400 Bad request
...
Hm..🤔 You didn't mention, but let me guess: the error message states - unsupported grant type or so. Right?
What grant type you're using EXACTLY? 🧐 Focus on "exactly"! Even one letter - more or less - may make the things wrong. 😉
PS: Print out what you're passing as body text and compare what has to be as we discussed in previous threads. Does it match?
- DB-Des
Dropbox Engineer
Hi @Lukag,
The following lines of code are actually appending the parameters to the URL, hence why you are receiving a 404.
Dim _command As String _command = "https://api.dropboxapi.com/oauth2/token " _command += " -d grant_type=refresh_token " _command += "-d refresh_token=" & _refresh_token _command += "-d client_id=" & _App_key _command += "-d client_secret=" & _App_secretAdditionally, as a reminder, endpoint /oauth2/token accepts ContentType: application/x-www-form-urlencoded. From your example, it looks like you are using application/json.
We'd recommend re-writing the logic of your app to use the corresponding ContentType and to pass the parameters in the body of the POST request.
I hope you find this information helpful!
I changed my code but i have an error 400 Bad request
(I try with api.dropboxapi.com and with api.dropbox.com , which one is the right one ? )
Dim _command As String
_command = "https://api.dropboxapi.com/oauth2/token "
Dim Request As HttpWebRequest
Request = HttpWebRequest.Create(_command)
Request.Method = "POST"Request.KeepAlive = True
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 Or SecurityProtocolType.Tls12 Or SecurityProtocolType.Tls11 Or SecurityProtocolType.Tls
Request.ContentType = "application/x-www-form-urlencoded"
Request.UserAgent = "Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36"
ServicePointManager.SecurityProtocol = CType(48, SecurityProtocolType) Or CType(192, SecurityProtocolType) Or CType(768, SecurityProtocolType) Or CType(3072, SecurityProtocolType)
Request.AllowAutoRedirect = True
Dim postbody As String = "&grant_type=refresh_token "
postbody += "&refresh_token=" & _refresh_token
postbody += "&client_id=" & _App_key
postbody += "&client_secret=" & _App_secretDim payload = Encoding.UTF8.GetBytes(postbody)
Request.ContentLength = payload.LengthUsing dataStream = Request.GetRequestStream()
dataStream.Write(payload, 0, payload.Length)
End UsingTry
Using response = CType(Request.GetResponse(), HttpWebResponse)
Using reader = New IO.StreamReader(response.GetResponseStream())
_file = reader.ReadToEnd()
End Using
End Using
Catch ex As WebException
Using response = CType(ex.Response, HttpWebResponse)
Using reader = New IO.StreamReader(response.GetResponseStream())
_errore = reader.ReadToEnd()
End Using
End Using
Catch ex As Exception
Throw
End Try
Lukag wrote:I changed my code but i have an error 400 Bad request
...
Hm..🤔 You didn't mention, but let me guess: the error message states - unsupported grant type or so. Right?
What grant type you're using EXACTLY? 🧐 Focus on "exactly"! Even one letter - more or less - may make the things wrong. 😉
PS: Print out what you're passing as body text and compare what has to be as we discussed in previous threads. Does it match?
It may be easier for you to execute curl, that you know how it works already, as shell command and read the StdOut that comes back. 🙋
sure but this is a call that i need and I would like to understand where I'm going wrong.
Lukag wrote:... I would like to understand where I'm going wrong.
Let say...🤔, where did you see/conclude from, that the above is the way do what you want to do? 🙂 I'll stop here. You know the rest.
You can take a look an example like this one, where external command gets executed in other application. Can you do the same but with your working curl command and parse the received output instead of just forward to your application terminal? 😉
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