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Cors access control allow origin4/21/2024 ![]() ![]() optionsSuccessStatus: Provides a status code to use for successful OPTIONS requests, since some legacy browsers (IE11, various SmartTVs) choke on 204. As a CORS error occurs when the external API server doesnt return the HTTP headers required by the CORS standard, you can add the missing header like Access.preflightContinue: Pass the CORS preflight response to the next handler.Set to an integer to pass the header, otherwise it is omitted. maxAge: Configures the Access-Control-Max-Age CORS header.Set to true to pass the header, otherwise it is omitted. credentials: Configures the Access-Control-Allow-Credentials CORS header.If not specified, no custom headers are exposed. Expects a comma-delimited string (ex: ‘Content-Range,X-Content-Range’) or an array (ex: ). exposedHeaders: Configures the Access-Control-Expose-Headers CORS header.If not specified, defaults to reflecting the headers specified in the request’s Access-Control-Request-Headers header. Expects a comma-delimited string (ex: ‘Content-Type,Authorization’) or an array (ex: ). allowedHeaders: Configures the Access-Control-Allow-Headers CORS header.Expects a comma-delimited string (ex: ‘GET,PUT,POST’) or an array (ex: ). methods: Configures the Access-Control-Allow-Methods CORS header.The function takes the request origin as the first parameter and a callback (called as callback(err, origin), where origin is a non-function value of the origin option) as the second. Function - set origin to a function implementing some custom logic.For example will accept any request from “” or from a subdomain of “”. Array - set origin to an array of valid origins.For example the pattern /example\.com$/ will reflect any request that is coming from an origin ending with “”. If it’s a match, the request origin will be reflected. RegExp - set origin to a regular expression pattern which will be used to test the request origin.For example if you set it to "" only requests from “” will be allowed. String - set origin to a specific origin. ![]() Boolean - set origin to true to reflect the request origin, as defined by req.header('Origin'), or set it to false to disable CORS.origin: Configures the Access-Control-Allow-Origin CORS header.Usage Simple Usage (Enable All CORS Requests) var express = require('express')Īpp.get('/products/:id', function (req, res, next) )Ĭonsole.log('CORS-enabled web server listening on port 80') This is a Node.js module available through the CORS is a node.js package for providing a Connect/ Express middleware that can be used to enable CORS with various options. ![]()
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