application/json不起作用，但是text/json不起作用

Question

在以下代码中，将ContentType设置为application/json不起作用（服务器发送Bad请求），但将其设置为text/json。为什么？

/*converts form Array to JSON*/ 
function objectifyForm(formArray) {//serialize data function 

    returnArray = {}; 
    for (var i = 0; i < formArray.length; i++){ 
    returnArray[formArray[i]['name']] = formArray[i]['value']; 
    } 
    return returnArray; 
} 

$(document).ready(function(){ 
    // click on form submit 
    $('#registration-form').on('submit',function(e){ 
    e.preventDefault(); 
    var details = JSON.stringify(objectifyForm($(this).serializeArray())); 
    console.log(details) 
     // send ajax 
     $.ajax({ 
      url: '/newreg', // url where to submit the request 
      type : "POST", // type of action POST || GET 
      datatype : "json", // data type 
      /* this doesn't work*/ 
      //contentType: "application/json; charset=utf-8", 
      /*this does*/ 
      contentType: "text/json; charset=utf-8", 
      data : details, 
/*handle success/failure*/ 
      success : function(result) {}, 
      error: function(xhr, resp, text) {} 
     }) 
    }); 
}); 

Answer 1

Play Framework后端可能存在错误或未配置的BodyParser。