Cross-Origin Read Blocking CORB

Question

I have called third party API using Jquery AJAX  I am getting following error in console      Cross-Origin Read Blocking  CORB  blocked cross-origin response MY URL with MIME type application json  See https   www chromestatus com feature 5629709824032768 for more details    I have used following code for Ajax call       ajax     type   GET     url  My Url    contentType   application json     dataType  jsonp     responseType  application json     xhrFields        withCredentials  false        headers         Access-Control-Allow-Credentials    true       Access-Control-Allow-Origin            Access-Control-Allow-Methods   GET        Access-Control-Allow-Headers   application json          success  function data        console log data          error  function error        console log  FAIL                                   When I checked in Fiddler  I have got the data in response but not in Ajax success method   Please help me out

User · Answer

There is an edge case worth mentioning in this context: Chrome (some versions, at least) checks CORS preflights using the algorithm set up for CORB. IMO, this is a bit silly because preflights don't seem to affect the CORB threat model, and CORB seems designed to be orthogonal to CORS. Also, the body of a CORS preflight is not accessible, so there is no negative consequence just an irritating warning.

Anyway, check that your CORS preflight responses (OPTIONS method responses) don't have a body (204). An empty 200 with content type application/octet-stream and length zero worked well here too.

You can confirm if this is the case you are hitting by counting CORB warnings vs. OPTIONS responses with a message body.

User · Answer

It s not clear from the question  but assuming this is something happening on a development or test client  and given that you are already using Fiddler you can have Fiddler respond with an allow response    Select the problem request in Fiddler Open the AutoResponder tab Click Add Rule and edit the rule to    Method OPTIONS server url here  e g  Method OPTIONS http   localhost  CORSPreflightAllow  Check Unmatched requests passthrough Check Enable Rules   A couple notes    Obviously this is only a solution for development testing where it isn t possible practical to modify the API service Check that any agreements you have with the third-party API provider allow you to do this As others have noted  this is part of how CORS works  and eventually the header will need to be set on the API server  If you control that server  you can set the headers yourself  In this case since it is a third party service  I can only assume they have some mechanism via which you are able to provide them with the URL of the originating site and they will update their service accordingly to respond with the correct headers

User · Answer

have you tried changing the dataType in your ajax request from jsonp to json  that fixed it in my case

User · Answer

You have to add CORS on the server side   If you are using nodeJS then   First you need to install cors by using below command    npm install cors --save   Now add the following code to your app starting file like   app js or server js   var express   require  express    var app   express     var cors   require  cors    var bodyParser   require  body-parser       enables cors app use cors      allowedHeaders     sessionId    Content-Type       exposedHeaders     sessionId       origin           methods    GET HEAD PUT PATCH POST DELETE      preflightContinue   false       require    router index   app

User · Answer

Try to install  Moesif CORS  extension if you are facing issue in google chrome  As it is cross origin request  so chrome is not accepting a response even when the response status code is 200

User · Answer

Return response with header  Access-Control-Allow-Origin     Check below code for the Php server response    lt  php header  Access-Control-Allow-Origin       header  Content-Type  application json    echo json encode  phparray

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In most cases  the blocked response should not affect the web page s behavior and the CORB error message can be safely ignored   For example  the warning may occur in cases when the body of the blocked response was empty already  or when the response was going to be delivered to a context that can t handle it  e g   a HTML document such as a 404 error page being delivered to an  tag     https   www chromium org Home chromium-security corb-for-developers  I had to clean my browser s cache  I was reading in this link  that  if the request get a empty response  we get this warning error  I was getting some CORS on my request  and so the response of this request got empty  All I had to do was clear the browser s cache  and the CORS got away  I was receiving CORS because the chrome had saved the PORT number on the cache  The server would just accept localhost 3010 and I was doing localhost 3002  because of the cache

User · Answer

It seems that this warning occured when sending an empty response with a 200   This configuration in my  htaccess display the warning on Chrome   Header always set Access-Control-Allow-Origin     Header always set Access-Control-Allow-Methods  POST GET HEAD OPTIONS PUT DELETE  Header always set Access-Control-Allow-Headers  Access-Control-Allow-Headers  Origin Accept  X-Requested-With  Content-Type  Access-Control-Request-Method  Access-Control-Request-Headers  Authorization   RewriteEngine On RewriteCond   REQUEST METHOD  OPTIONS RewriteRule       R 200 L    But changing the last line to   RewriteRule       R 204 L    resolve the issue

User · Answer

dataType  jsonp      You are making a JSONP request  but the server is responding with JSON   The browser is refusing to try to treat the JSON as JSONP because it would be a security risk   If the browser did try to treat the JSON as JSONP then it would  at best  fail    See this question for more details on what JSONP is   Note that is a nasty hack to work around the Same Origin Policy that was used before CORS was available  CORS is a much cleaner  safer  and more powerful solution to the problem     It looks like you are trying to make a cross-origin request and are throwing everything you can think of at it in one massive pile of conflicting instructions   You need to understand how the Same Origin policy works    See this question for an in-depth guide     Now a few notes about your code    contentType   application json       This is ignored when you use JSONP You are making a GET request  There is no request body to describe the type of  This will make a cross-origin request non-simple  meaning that as well as basic CORS permissions  you also need to deal with a pre-flight    Remove that     dataType  jsonp       The server is not responding with JSONP    Remove this   You could make the server respond with JSONP instead  but CORS is better     responseType  application json      This is not an option supported by jQuery ajax  Remove this      xhrFields          withCredentials  false        This is the default  Unless you are setting it to true with ajaxSetup  remove this      headers         Access-Control-Allow-Credentials    true       Access-Control-Allow-Origin            Access-Control-Allow-Methods   GET        Access-Control-Allow-Headers   application json            These are response headers  They belong on the response  not the request  This will make a cross-origin request non-simple  meaning that as well as basic CORS permissions  you also need to deal with a pre-flight

User · Answer

If you are working on localhost  try this  this one the only extension and method that worked for me  Angular  only javascript  no php   https   chrome google com webstore detail moesif-orign-cors-changer digfbfaphojjndkpccljibejjbppifbc related hl en

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Cross-Origin Read Blocking  CORB   an algorithm by which dubious cross-origin resource loads may be identified and blocked by web browsers before they reach the web page  It is designed to prevent the browser from delivering certain cross-origin network responses to a web page   First Make sure these resources are served with a correct  Content-Type   i e  for JSON MIME type -  text json    application json    HTML MIME type -  text html    Second  set mode to cors i e  mode cors   The fetch would look something like this   fetch  https   example com api request                 method   POST               body  JSON stringify data               mode   cors               headers                     Content-Type    application json                    Accept    application json                                 then  data    gt  data json         then  resp    gt  console log resp        catch  err    gt  console log err     references  https   chromium googlesource com chromium src   master services network cross origin read blocking explainer md  https   www chromium org Home chromium-security corb-for-developers

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I had the same problem with my Chrome extension  When I tried to add to my manifest  content scripts  option this part                 matches       lt all urls gt               css      myStyles css              js      test js              And I remove the other part from my manifest  permissons     https         Only when I delete it CORB on one of my XHR reqest disappare   Worst of all that there are few XHR reqest in my code and only one of them start to get CORB error  why CORB do not appare on other XHR I do not know  why manifest changes coused this error I do not know   That s why I inspected the entire code again and again by few hours and lost a lot of time

User · Answer

In a Chrome extension  you can use  chrome webRequest onHeadersReceived addListener   to rewrite the server response headers  You can either replace an existing header or add an additional header  This is the header you want   Access-Control-Allow-Origin      https   developers chrome com extensions webRequest event-onHeadersReceived  I was stuck on CORB issues  and this fixed it for me

User · Answer

Response headers are generally set on the server  Set  Access-Control-Allow-Headers  to  Content-Type  on server side

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I encountered this problem because the format of the jsonp response from the server is wrong  The incorrect response is as follows   callback   apple    peach      The problem is  the object inside callback should be a correct json object  instead of a json array  So I modified some server code and changed its format   callback   fruit     apple    peach       The browser happily accepted the response after the modification

[javascript] Cross-Origin Read Blocking (CORB)

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