Access Control Request Headers, is added to header in AJAX request with jQuery

What you saw in Firefox was not the actual request; note that the HTTP method is OPTIONS, not POST. It was actually the ‘pre-flight’ request that the browser makes to determine whether a cross-domain AJAX request should be allowed:

http://www.w3.org/TR/cors/

The Access-Control-Request-Headers header in the pre-flight request includes the list of headers in the actual request. The server is then expected to report back whether these headers are supported in this context or not, before the browser submits the actual request.

Related Posts:

  1. jQuery Ajax File Upload
  2. jQuery Ajax POST example with PHP
  3. Cross-Origin Read Blocking (CORB)
  4. syntax error: unexpected token <
  5. Infinite Scrolling in Asp.Net MVC with jQuery / AJAX Issues
  6. ajax jquery simple get request
  7. jQuery get textarea text
  8. jQuery AJAX cross domain
  9. Send POST data using XMLHttpRequest
  10. Set timeout for ajax (jQuery)
  11. How to generate a simple popup using jQuery
  12. What does on() in JavaScript do?
  13. jQuery AJAX submit form
  14. How can I upload files asynchronously with jQuery?
  15. Adding images to a Bootstrap Carousel with AJAX
  16. AJAX response error: net::ERR_EMPTY_RESPONSE
  17. Refresh/reload the content in Div using jquery/ajax
  18. SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
  19. How to manage a redirect request after a jQuery Ajax call
  20. FormData append not working
  21. Uncaught TypeError: Cannot read property ‘toLowerCase’ of undefined
  22. Download a file by jQuery.Ajax
  23. Ajax success function
  24. AJAX not Working with php as supposed
  25. Cannot read property ‘push’ of undefined when combining arrays
  26. How to set header and options in axios?
  27. How to deal with net::ERR_SSL_PROTOCOL_ERROR?
  28. Check if checkbox is checked with jQuery
  29. Getting Error “Form submission canceled because the form is not connected”
  30. Is there a link to the “latest” jQuery library on Google APIs?
  31. How can jQuery deferred be used?
  32. Uncaught TypeError : cannot read property ‘replace’ of undefined In Grid
  33. Failed to load resource: net::ERR_FILE_NOT_FOUND loading json.js
  34. Disable/enable an input with jQuery?
  35. Get class name using jQuery
  36. Use images like checkboxes
  37. JavaScript error (Uncaught SyntaxError: Unexpected end of input)
  38. ChangeDate – Date Picker Bootstrap
  39. How to convert selected HTML to Json?
  40. How to Open New window on every Click
  41. Jquery Ajax Call, doesn’t call Success or Error
  42. How to create a stopwatch using JavaScript?
  43. With jQuery, how do I capitalize the first letter of a text field while the user is still editing that field?
  44. How to move an element after another element using JS or jquery?
  45. Why is the jquery script not working?
  46. JQuery Datatables : Cannot read property ‘aDataSort’ of undefined
  47. Load image with jQuery and append it to the DOM
  48. Change text on hover, then return to the previous text
  49. Javascript/Jquery Convert string to array
  50. JSON.parse() not working
  51. How to send email by using javascript or jquery
  52. How to get current date in jQuery?
  53. Print the contents of a DIV
  54. How to Scroll Down – JQuery
  55. Embedding instagram webpage inside an iframe
  56. Do something if screen width is less than 960 px
  57. Uncaught TypeError: Cannot read property ‘toUpperCase’ of undefined
  58. jQuery remove options from select
  59. JavaScript post request like a form submit
  60. is there something like isset of php in javascript/jQuery?
  61. jQuery – Dynamically Create Button and Attach Event Handler
  62. Highlight a word with jQuery
  63. Error: TypeError: $(…).dialog is not a function
  64. getContext is not a function
  65. navigator.geolocation.getCurrentPosition sometimes works sometimes doesn’t
  66. How to check if the URL contains a given string?
  67. How should I initialize jQuery?
  68. How to reload page every 5 seconds?
  69. Fire oninput event with jQuery
  70. What is the non-jQuery equivalent of ‘$(document).ready()’?
  71. Changing the selected option of an HTML Select element
  72. “NS_ERROR_DOM_BAD_URI: Access to restricted URI denied”
  73. How to set “style=display:none;” using jQuery’s attr method?
  74. How to dequeue a script?
  75. WordPress Ajax always returns a 404 error
  76. Custom plugin giving: wp-admin/admin-ajax.php 400 (Bad Request)
  77. admin-ajax.php HTTP400: BAD REQUEST – The request could not be processed by the server due to invalid syntax
  78. Click loads template via ajax
  79. How to speed up admin-ajax.php in wordpress
  80. Sending jsPDF documents to the server
  81. Ajax Modal Flickers When Opened Multiple Times
  82. splitting the URL using jQuery
  83. List of JS Events for Widgets?
  84. Fancybox type popup window that’s not an iframe
  85. url – ajax loaded but no JS
  86. Properly embed javascript into WP (using function.php) – doesn’t work?
  87. Uncaught ReferenceError: jQuery is not defined – although jQuery is loaded [closed]
  88. Why i can’t get custom fields value or post ID via Ajax?
  89. Custom AJAX form not working async
  90. Accessing an API with jQuery and AJAX
  91. Putting custom html/js page into Elementor as it’s own block
  92. Get the ID of a page in Parent combobox in editor
  93. Can’t Listen to KeyDown in TInyMCE Iframe (jQuery) and Pass it to Parent HTML FORM
  94. How to echo a PHP code into WooCommerce variation product?
  95. How to call a function from functions.php with ajax?
  96. Ajax post doesnt call succes after got the response
  97. Get ajaxForm response value
  98. Colorbox not working on native WordPress gallery when gallery is loaded thru AJAX
  99. Open image gallery on link click
  100. Uncaught ReferenceError: tippy is not defined

Leave a Comment