Keep getting No Access-Control-Allow-Origin error with XMLHttpRequest

Question

I would have solved this issue by using jQuery   ajax function but in this case jQuery is not option   Instead I am going with CORS request   I feel there is something wrong with the webserver that is responding to the request and I am having a hard time figuring out what the issue is   Here is my code for creating the CORS request  var httpRequest   new XMLHttpRequest    httpRequest open  POST   url  true   httpRequest setRequestHeader   Access-Control-Allow-Origin         httpRequest setRequestHeader   Content-Type    application json     httpRequest onerror   function XMLHttpRequest  textStatus  errorThrown      console log   The data failed to load          console log JSON stringify XMLHttpRequest       httpRequest onload   function       console log  SUCCESS         Here is the console log error      XMLHttpRequest cannot load   http   test testhost com testpage  Request header field   Access-Control-Allow-Origin is not allowed by   Access-Control-Allow-Headers    Here are the header information    gt  Remote Address              80 Request  gt  URL http   test testdomain com testpage Request  gt  Request Method OPTIONS  gt  Status Code 200 OK   Request Headers   OPTIONS  content-network HTTP 1 1 Host  test testhost com Connection  keep-alive Cache-Control  no-cache Pragma  no-cache Access-Control-Request-Method  POST Origin  http   test testdomain com User-Agent  Mozilla 5 0  Macintosh  Intel Mac OS X 10 9 4  AppleWebKit 537 36  KHTML  like Gecko  Chrome 36 0 1985 125 Safari 537 36 Access-Control-Request-Headers  access-control-allow-origin  content-type Accept      Referer  http   test testdomain com  Accept-Encoding  gzip deflate sdch Accept-Language  en-US en q 0 8   Response Headers   HTTP 1 1 200 OK Date  Thu  14 Aug 2014 20 17 25 GMT Server  Apache Last-Modified  Thu  14 Aug 2014 20 17 25  0000 Cache-Control  no-cache  must-revalidate  post-check 0  pre-check 0 ETag   1408047445  Access-Control-Allow-Origin    Access-Control-Allow-Headers  Content-Type Vary  Accept-Encoding Content-Encoding  gzip Access-Control-Allow-Headers  origin  x-requested-with  content-type Access-Control-Allow-Methods  PUT  GET  POST  DELETE  OPTIONS Content-Length  6117 Connection  close Content-Type  text html  charset utf-8

User · Answer

Enable CORS on backend server  or add chrome extensions  https   chrome google com webstore search CORS utm source chrome-ntp-icon and make ON

User · Answer

We see this a lot with OAuth2 integrations  We provide API services to our Customers  and they ll naively try to put their private key into an AJAX call   This is really poor security  And well-coded API Gateways  backends for frontend  and other such proxies  do not allow this  You should get this error    I will quote  aspillers comment and change a single word   Access-Control-Allow-Origin is a header sent in a server response which indicates IF the client is allowed to see the contents of a result     ISSUE  The problem is that a developer is trying to include their private key inside a client-side  browser  JavaScript request  They will get an error  and this is because they are exposing their client secret    SOLUTION  Have the JavaScript web application talk to a backend service that holds the client secret securely  That backend service can authenticate the web app to the OAuth2 provider  and get an access token  Then the web application can make the AJAX call

User · Answer

Your server s response allows the request to include three specific non-simple headers   Access-Control-Allow-Headers origin  x-requested-with  content-type   but your request has a header not allowed by the server s response   Access-Control-Request-Headers access-control-allow-origin  content-type   All non-simple headers sent in a CORS request must be explicitly allowed by the Access-Control-Allow-Headers response header  The unnecessary Access-Control-Allow-Origin header sent in your request is not allowed by the server s CORS response  This is exactly what the     not allowed by Access-Control-Allow-Headers  error message was trying to tell you   There is no reason for the request to have this header  it does nothing  because Access-Control-Allow-Origin is a response header  not a request header   Solution  Remove the setRequestHeader call that adds a Access-Control-Allow-Origin header to your request

User · Answer

In addition to your CORS issue  the server you are trying to access has HTTP basic authentication enabled  You can include credentials in your cross-domain request by specifying the credentials in the URL you pass to the XHR   url    http   username password test testhost com testpage

User · Answer

Remove   httpRequest setRequestHeader   Access-Control-Allow-Origin               and add   httpRequest withCredentials   false

[javascript] Keep getting No 'Access-Control-Allow-Origin' error with XMLHttpRequest

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