B4X

REST through HTTP Proxy

See more REST Examples

Demonstrates how to connect through an HTTP proxy to make REST API calls. B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  This example connects to a REST server through an HTTP proxy.
'  It will connect to the Amazon AWS service for this example.
Dim rest As ChilkatRest
rest.Initialize("rest")
Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Set the HTTP proxy domain or IP address, and port.
socket.HttpProxyHostname = "192.168.1.100"
socket.HttpProxyPort = 8088

'  We want to tell the socket object that we're doing HTTP over the proxy connection.
'  This is because an HTTP proxy used for other protocols (IMAP, SMTP, SSH, FTP, etc.) 
'  can require some internal differences in behavior (i.e. how we do things).
socket.HttpProxyForHttp = True

'  Other properties exist for specifying a proxy login, password, and authentication method (such as NTLM),
'  but these are not used in this example.

'  Connect through the HTTP proxy to the Amazon AWS server for the S3 service.
Dim bTls As Boolean = True
Dim port As Int = 443
Dim maxWaitMs As Int = 5000
success = socket.Connect("s3.amazonaws.com", port, bTls, maxWaitMs)
If success <> True Then
    Log("Connect Failure Error Code: " & socket.ConnectFailReason)
    Log(socket.LastErrorText)
    Return
End If


'  Use the proxied TLS connection:
success = rest.UseConnection(socket, True)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


'  Provide AWS credentials for the REST call.
Dim authAws As ChilkatAuthAws
authAws.Initialize
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"
success = rest.SetAuthAws(authAws)

'  List all buckets for the account...
Dim responseXml As String = rest.FullRequestNoBody("GET", "/")
If rest.LastMethodSuccess <> True Then
    Log(rest.LastErrorText)
    Return
End If


Dim xml As ChilkatXml
xml.Initialize
success = xml.LoadXml(responseXml)

'  Show the full XML returned.
Log(xml.GetXml)

'  Iterate over the buckets, showing each bucket name.
success = xml.FindChild2("Buckets")
If xml.FirstChild2 = True Then
    Log(xml.GetChildContent("Name"))
    Do While (xml.NextSibling2 = True)
        Log(xml.GetChildContent("Name"))
    Loop
End If

'  Move the internal pointer back to the root node.
xml.GetRoot2