[SalesForce] Unable to do insert/update (upsert) operations using PUT method with out using rest resource class in REST API

You have to authenticate before you can call the rest resource. You authentication is what allows you to access the endpoint

A little while ago, Paul McGurn blogged how to create a public (SOAP-based) web service via a Force.com Site. As Paul explains, you add your web service class to the Enabled Apex Classes in the Site’s Public Access Settings. You’ll also need to add the appropriate object and field-level permissions for any data you will be exposing; remembering, of course, that this web service will be accessible without any authentication!

As I was setting up a WebHook the other day, I realized that the same principle applies to Apex REST Methods – add the class and any relevant objects/fields to your Site’s Public Access Settings, and you can access the REST methods via the Site URL. Let’s code up a simple example; here’s my Apex class:

https://developer.salesforce.com/blogs/developer-relations/2012/02/quick-tip-public-restful-web-services-on-force-com-sites.html

Oh Got the solution. I think I need to spend more time with my research before asking question here.

Here is the working code. Actually after adding content type in header(also JSON.stringify()). It works

Below is my working code

function createSobjectRecord() {
    var accountInfo = {
        "Name": "Testing Jquery with Rest"
    };
    var accountInfoJson = JSON.stringify(accountInfo);
    $j.ajax({
        type: "POST",
        url: "/services/data/v35.0/sobjects/Account",
        headers: {
            'Authorization': "OAuth " + sessionId,
            'Content-Type': 'application/json'
        },
        crossDomain: true,
        data: JSON.stringify(accountInfo),
        dataType: 'json',
        success: function(responseData, status, xhr) {
            console.log(responseData);
        },
        error: function(request, status, error) {
            console.log(request.responseText);
        }
    });

Complete code to help other may be it will helpful for someone.

GET, POST AND DELETE Method using Jquery

<apex:page>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <div>
        <input  class="btn" value="Get Account list" type="button" onclick="getSobjectList()" />
        <input  class="btn" value="Create Account Record" type="button" onclick="createSobjectRecord()" />
        <input class="btn" value="Delete Account Record" type="button" onclick="deleteSobjectRecord()" />
    </div>
    <div id="warehouseList">
    </div>
    <script type="text/javascript">
        var $j = jQuery.noConflict();
        var sessionId = '{!$Api.Session_ID}';
        function getSobjectList() {
            $j.ajax({
                type: "GET",
                url: "/services/data/v35.0/query?q="+''+"{!URLENCODE('SELECT Id, Name FROM Account')}",
                headers: {"Authorization" : "OAuth " + sessionId},
                crossDomain : true,
                dataType: 'application/json',
                success: function (responseData) {
                    console.log(responseData);
                },
                error: function (request, status, error) {
                    console.log(request.responseText);
                }
            });
        }
        var recordId;
        function createSobjectRecord() {
             var accountInfo = { "Name" :"Testing Jquery with Rest"};
             var accountInfoJson = JSON.stringify(accountInfo);
             $j.ajax({
                type: "POST",
                url: "/services/data/v35.0/sobjects/Account",
                headers : {
                        'Authorization' : "OAuth " + sessionId,
                        'Content-Type' : 'application/json'
                  },
                crossDomain : true,
                data: JSON.stringify(accountInfo),
                dataType: 'json',
                success: function (responseData, status, xhr) {
                    console.log(responseData.id);
                    recordId = responseData.id;
                },
                error: function (request, status, error) {
                    console.log(request.responseText);
                }
            });
        }
        function deleteSobjectRecord(){
            $j.ajax({
                type: "Delete",
                url: "/services/data/v35.0/sobjects/Account/"+recordId,
                headers : {
                        'Authorization' : "OAuth " + sessionId,
                        'Content-Type' : 'application/json'
                  },
                crossDomain : true,
                success: function (responseData, status, xhr) {
                    console.log(responseData);
                },
                error: function (request, status, error) {
                    console.log(request.responseText);
                }
            });
        }
    </script>
</apex:page>