![]() The browser will allow code running on to access the response because the origins match. The server on returns the following response: This header is returned by a server when a website requests a cross-domain resource, with an Origin header added by the browser.įor example, suppose a website with origin causes the following cross-domain request: The CORS specification identifies a collection of protocol headers of which Access-Control-Allow-Origin is the most significant. The cross-origin resource sharing (CORS) specification prescribes header content exchanged between web servers and browsers that restricts origins for web resource requests outside of the origin domain. Implementing simple cross-origin resource sharing A web browser compares the Access-Control-Allow-Origin with the requesting website's origin and permits access to the response if they match. The Access-Control-Allow-Origin header is included in the response from one website to a request originating from another website, and identifies the permitted origin of the request. What is the Access-Control-Allow-Origin response header? Browsers permit access to responses to cross-origin requests based upon these header instructions. The cross-origin resource sharing specification provides controlled relaxation of the same-origin policy for HTTP requests to one website domain from another through the use of a collection of HTTP headers. In this section we explain what the Access-Control-Allow-Origin header is in respect of CORS, and how it forms part of CORS implementation. Router.CORS and the Access-Control-Allow-Origin response header This works fine and I no longer get the CORS error but ran into another issue, this is the route I'm calling ![]() Methods: "GET,HEAD,PUT,OPTIONS,POST,DELETE", So this is what I have now in my index.js So after trying the suggestions in the comment and reading more articles I better understood the CORS package and I noticed an error in my configuration. ![]() What is going on? Please what am I doing wrong? if (_ENV = "development") /auth/login/success directly in the browser I can see the json data is been sent fine. I also tried putting the URL directly instead of an environment variable, but that didn't work either.Ĭonst cookieSession = require("cookie-session") Ĭonst connectDB = require("./config/db") Ĭonst authRoute = require("./routes/auth.route") Ĭonst userRoute = require("./routes/user.route") Ĭonst adminRoute = require("./routes/admin.route") Ĭonst transactionRoute = require("./routes/transaction.route") This my index.js and the codes commented out are some of the solutions and CORS settings I've tried. I have searched and gone through multiple stack overflow posts and tried some of the answers and suggestions but nothing seems to work. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. No 'Access-Control-Allow-Origin' header is present on the requested resource. I'm trying to integrate passport-google-oauth20 in my MERN application and although everything works fine in development on my local host but in production, it keeps throwing this error Personal blog posts that are relevant to the subreddit's stated subject matter don't need prior approval (and are encouraged!). If you want to post something self-promotional, please message the mods first. Titles that begin with "hey guys" will be removed. If you're in doubt, message the mods first. The following are not allowed: Requests for subscribers, asking for "test users" for your new JS course, offering paid mentorships, and/or premium courses. If you’re asking for help, include enough information for others to recreate your problem. With a nod to practicality, questions and posts about HTML, CSS, and web developer tools are also encouraged. Everyone should feel comfortable asking any and all JavaScript questions they have here. This subreddit is a place for people to learn JavaScript together.
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