How to solve Redirect has been blocked by CORS policy No Access-Control-Allow-Origin header

Question

I am working on an app using Vue js  According to my setting I  need to pass to a variable to my URL when setting change    lt  -- language  lang-js -- gt         get  http   172 16 1 157 8002 firstcolumn     c1v         c1b  function  data              some code              But when my app hit on URL  it shows the following message   Failed to load http   172 16 1 157 8002 firstcolumn 2017-03-01 2017-10-26  Redirect from  http   172 16 1 157 8002 firstcolumn 2017-03-01 2017-10-26  to  http   172 16 1 157 8002 firstcolumn 2017-03-01 2017-10-26   has been blocked by CORS policy  No  Access-Control-Allow-Origin  header is present on the requested resource  Origin  http   localhost 8080  is therefore not allowed access

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Or like this    npm install cors  cors   require  cors    app use cors

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In addition to what awd mentioned about getting the person responsible for the server to reconfigure  an impractical solution for local development  I use a change-origin chrome plugin like this   Moesif Orign  amp  CORS Changer  You can make your local dev server  ex  localhost 8080  to appear to be coming from 172 16 1 157 8002 or any other domain

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install  npm i cors  Then include cors    app get  quot  list quot  cors    req res    gt

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You can solve this temporarily by using the Firefox add-on  CORS Everywhere  Just open Firefox  press Ctrl Shift A   search the add-on and add it

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You won t believe this  Make sure to add     at the end of the  url   I got a similar error with this code   fetch https   itunes apple com search term jack johnson   then  response   gt        return response json        then data   gt        console log data results      catch error   gt  console log  Request failed    error     The error I got    Access to fetch at  https   itunes apple com search term jack johnson   from origin  http   127 0 0 1 5500  has been blocked by CORS policy   No  Access-Control-Allow-Origin  header is present on the requested  resource  If an opaque response serves your needs  set the request s mode to  no-cors  to fetch the resource with CORS disabled    But I realized after a lot of research that the problem was that I did not copy the  right URL address from the iTunes API documentation   It should have been  https   itunes apple com search term jack johnson   not  https   itunes apple com search term jack johnson     Notice the dot at the end   There is a huge explanation about why the dot is important quoting issues about DNS and character encoding but the truth is you probably do not care  Try adding the dot it might work for you too   When I added the     everything worked like a charm   I hope it works for you too

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If you have control over your server  you can use PHP    lt  PHP header  Access-Control-Allow-Origin         gt

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Ask the person maintaining the server at http   172 16 1 157 8002  to add your hostname to Access-Control-Allow-Origin hosts  the server should return a header similar to the following with the response-  Access-Control-Allow-Origin  yourhostname port

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Hello If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on  So the browser is blocking it as it usually allows a request in the same origin for security reasons  You need to do something different when you want to do a cross-domain request  A tutorial about how to achieve that is Using CORS   When you are using postman they are not restricted by this policy  Quoted from Cross-Origin XMLHttpRequest   Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers  but they re limited by the same origin policy  Extensions aren t so limited  An extension can talk to remote servers outside of its origin  as long as it first requests cross-origin permissions

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You are making a request to external domain 172 16 1 157 8002  from your local development server that is why it is giving cross origin exception  Either you have to allow headers Access-Control-Allow-Origin   in both frontend and backend or alternatively use this extension cors header toggle - chrome extension unless you host backend and frontend on the same domain

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The approved answer to this question is not valid  You need to set headers on your server-side code app use  req res next   gt       res setHeader  Acces-Control-Allow-Origin            res setHeader  Acces-Control-Allow-Methods   GET POST PUT PATCH DELETE        res setHeader  Acces-Contorl-Allow-Methods   Content-Type   Authorization        next

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To add the CORS authorization to the header using Apache  simply add the following line inside either the  lt Directory gt    lt Location gt    lt Files gt  or  lt VirtualHost gt  sections of your server config  usually located in a   conf file  such as httpd conf or apache conf   or within a  htaccess file      Header set Access-Control-Allow-Origin       And then restart apache   Altering headers requires the use of mod headers  Mod headers is enabled by default in Apache  however  you may want to ensure it s enabled

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Thanks all  I solved by this extension on chrome   Allow CORS  Access-Control-Allow-Origin

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Simply by adding below text in the  httpd conf file will solve this issue      Header set Access-Control-Allow-Origin

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you have to customize security for your browser or allow permission through customizing security   it is impractical for your local testing  to know more about please go through the link  https   developer mozilla org en-US docs Web HTTP CORS

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get  https   172 16 1 157 8002 firstcolumn     c1v         c1b  function  data          some code          Just put  https

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Do specify  CrossOrigin origins    quot http   localhost 8081 quot   in Controller class

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When you have this problem with Chrome  you don t need an Extension  Start Chrome from the Console  chrome exe --user-data-dir  C  Chrome dev session  --disable-web-security Maybe you have to close all Tabs in Chrome and restart it

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I had the same problem in my Vue js and SpringBoot projects  If somebody work with spring you can add this code    Bean public FilterRegistrationBean simpleCorsFilter           UrlBasedCorsConfigurationSource source   new UrlBasedCorsConfigurationSource          CorsConfiguration config   new CorsConfiguration          config setAllowCredentials true               URL below needs to match the Vue client URL and port         config setAllowedOrigins Collections singletonList  http   localhost 8080          config setAllowedMethods Collections singletonList              config setAllowedHeaders Collections singletonList              source registerCorsConfiguration        config         FilterRegistrationBean bean   new FilterRegistrationBean lt  gt  new CorsFilter source        bean setOrder Ordered HIGHEST PRECEDENCE         return bean           I found solution in this article Build a Simple CRUD App with Spring Boot and Vue js

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Try running this command in your terminal and then test it again   curl -H  origin  originHost  -v  RequestedResource    Eg   If my originHost equals https   localhost 8081  and my RequestedResource equals https   example com   My command would be as below   curl -H  origin  https   localhost 8081   -v  https   example com     If you can notice the following line then it should work for you    lt  access-control-allow-origin     Hope this helps

[javascript] How to solve 'Redirect has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header'?

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