Questions tagged [preflight]

An HTTP OPTIONS request, known as a preflight, is automatically initiated by browsers to servers prior to attempting specific cross-origin requests. This is done to confirm whether the server has approved receiving such requests.

Encountering an undisclosed CORS error on all requests from Angular frontend to NodeJS Express Server during preflight 200

After thorough testing with Postman, my backend server is functioning properly and generating the desired responses for all requests. However, my Angular app is encountering an unknown CORS error on every request despite receiving a 200 Preflight response ...

node.jsangularexpresscorspreflight

The access-control-allow-headers token is absent from the CORS header 'Access-Control-Allow-Headers' during the CORS preflight process

I am facing an issue with two VS projects: one has MVC5 controllers exposed, while the other is an Angular client. I need the Angular client to be able to query the controllers. I have done some research and attempted the following steps: I added the f ...

angularjsasp.net-mvccorspreflight

Tips for implementing cross-origin Reporting API reports with the Report-To header

My API collects Content Security Policy (CSP) violation reports. With the replacement of report-uri by report-to directive, I decided to make the switch. Unfortunately, I'm facing issues with receiving cross-origin reports. I have attempted to use the ...

node.jsexpressgoogle-chromecontent-security-policypreflight

Cross-Origin Resource Sharing (CORS) in OAuth: Preflight request response does not meet access control requirements

Currently, I am in the process of implementing the OAuth 2 flow for my web application where the server is responsible for granting authorization codes and access tokens. An issue arises when attempting to send the code back to a third-party website (in t ...

node.jsexpressoauth-2.0corspreflight

Unable to Transmit Authorization Header in Cross-Domain Access Situation

My Node.js server has cross-origin communication enabled, allowing my Vue application to access its API from a different origin where static assets are served. This is achieved by setting the following code in Node.js: res.setHeader('Access-Control-Allow-O ...

javascriptnode.jsauthenticationcorspreflight

Executing a node.js function within an Angular 2 application

Currently, I am running an Angular2 application on http://localhost:4200/. Within this app, I am attempting to call a function located in a separate node.js application that is running on http://localhost:3000/. This is the function call from my Angular2 ...

javascriptnode.jsangularcorspreflight