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#OData - Calling SAP service that has Single sign on access.

Using client script, we can make call to service. the service itself will check for the Authentication and authorization. below is the Script to make a GET call.

$.ajax({
                type: 'Get',
                beforeSend: function (xhr, settings) {
                    xhr.setRequestHeader('X-CSRF-Token', "Fetch");
                },
                cache: false,
                url: 'URL here'
                dataType: 'xml',
                xhrFields: {
                    withCredentials: true
                },
                crossDomain: true,
                success: function (response, status, xhr) {
                    globalToken = xhr.getResponseHeader('X-CSRF-Token');
                    console.log(globalToken);
                },
                error: function (xhr, status, error) {
                    console.log(xhr);
                    console.log(status);
                    console.log(error);
                    if (xhr.status == 404) {
                        errorMessage = error;
                    } else {
                        errorMessage = xhr.responseJSON.error.message.value;
                    }
                 
                },
                complete: function (xhr, status) {
                 
                    if (xhr.status === 200) {
//next action here
                       }
                 
                }
  });

POST
$.ajax({
                type: 'Get',
                beforeSend: function (xhr, settings) {
                    xhr.setRequestHeader('X-CSRF-Token', "Fetch");
                },
                cache: false,
                url: 'GET Url here'
                dataType: 'xml',
                xhrFields: {
                    withCredentials: true
                },
                crossDomain: true,
                success: function (response, status, xhr) {
                    globalToken = xhr.getResponseHeader('X-CSRF-Token');
                    console.log(globalToken);
                },
                error: function (xhr, status, error) {
                    console.log(xhr);
                    console.log(status);
                    console.log(error);
                    if (xhr.status == 404) {
                        errorMessage = error;
                    } else {
                        errorMessage = xhr.responseJSON.error.message.value;
                    }
                 
                },
                complete: function (xhr, status) {
               
                    if (xhr.status === 200) {
                         if (globalToken != '') {
                            // CALL POST to SAP
                                                     
                            $.ajax({
                                async: false,
                                url: 'POST Url here'
                                beforeSend: function (xhr) {
                                    xhr.setRequestHeader('X-CSRF-Token', globalToken);
                                },
                                type: 'Post',
                                dataType: "json",
                                contentType: "application/json; charset=utf-8",
                                data: JSON.Stringify(postJsonObjectString),
                                crossDomain: true,
                                success: function (response, status, xhr) {
                                    output= response.OutputNumber;
                                 
                                },
                                error: function (xhr, status, error) {
                                    console.log(xhr);
                                    console.log(status);
                                    console.log(error);
                                    console.log(xhr.responseJSON.error.code);
                                 
                                 
                                },
                                complete: function (xhr, status) {
                                 
                                    if (xhr.status === 201) {
                                     
                                    }
                                    else {
                                     
                                     
                                    }
                                }
                            });

                        } else {
                         
                            alert('Failed to receive Token.');
                        }
                    }
                    else {
                     alert('Failed to receive Token.'); 
                    }
               
                }
            });
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