(PureBasic) Duplicate curl -u user:password with Chilkat HTTP

Demonstrates how to duplicate a curl command that uses the -u username:password option. (This assumes HTTP Basic Authentication, and Chilkat requires Basic authentication to be over a TLS connection.)

Duplicates the following curl command:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

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IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkHttpRequest.pb"

Procedure ChilkatExample()

    ;  It requires the Chilkat API to have been previously unlocked.
    ;  See Global Unlock Sample for sample code.

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    req.i = CkHttpRequest::ckCreate()
    If req.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  The AddHeader method corresponds to the curl "-H" argument.
    CkHttpRequest::ckAddHeader(req,"Accept","application/json")
    CkHttpRequest::ckAddHeader(req,"Accept-Language","en_US")

    ;  The curl "-d" argument specifies the HTTP request body.  In this case,
    ;  we're sending an application/x-www-form-urlencoded request, and therefore
    ;  the body contains the URL-encoded query parameters.
    CkHttpRequest::ckAddParam(req,"grant_type","client_credentials")

    CkHttp::setCkLogin(http, "PAYPAL_REST_API_CLIENT_ID")
    CkHttp::setCkPassword(http, "PAYPAL_REST_API_SECRET")

    ;  Sends a POST request where the Content-Type is application/x-www-form-urlencoded
    resp.i = CkHttp::ckPostUrlEncoded(http,"https://api.sandbox.paypal.com/v1/oauth2/token",req)
    If CkHttp::ckLastMethodSuccess(http) <> 1
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkHttpRequest::ckDispose(req)
        ProcedureReturn
    EndIf

    If CkHttpResponse::ckStatusCode(resp) <> 200
        Debug "Error status code: " + Str(CkHttpResponse::ckStatusCode(resp))
        Debug CkHttpResponse::ckBodyStr(resp)
        CkHttpResponse::ckDispose(resp)

        CkHttp::ckDispose(http)
        CkHttpRequest::ckDispose(req)
        ProcedureReturn
    EndIf

    ;  The JSON response is in the resp BodyStr property
    Debug CkHttpResponse::ckBodyStr(resp)
    Debug "-- Success."

    CkHttpResponse::ckDispose(resp)



    CkHttp::ckDispose(http)
    CkHttpRequest::ckDispose(req)


    ProcedureReturn
EndProcedure