preflight | 易学教程

Response for preflight has invalid http status code 404 in my angular project while consuming web api

阅读更多关于 Response for preflight has invalid http status code 404 in my angular project while consuming web api

问题 I know that it's CORS problem. I have enabled cors in web api server side. Get method is working fine but while dealing with post method I am facing problem . Please some one answer me with very simple post example both on web api and client side. With explanation of how to deal with preflight, options etc.. Console 1) zone.js:2935 OPTIONS http://localhost:49975/api/Add_Client_/postgoals 404 (Not Found) 2) Failed to load http://localhost:49975/api/Add_Client_/postgoals: Response for preflight

Confused about how to handle CORS OPTIONS preflight requests

阅读更多关于 Confused about how to handle CORS OPTIONS preflight requests

I'm new to working with Cross Origin Resource Sharing and trying to get my webapp to respond to CORS requests. My webapp is a Spring 3.2 app running on Tomcat 7.0.42. In my webapp's web.xml, I have enabled the Tomcat CORS filter:   <filter> <filter-name>CorsFilter</filter-name> <filter-class>org.apache.catalina.filters.CorsFilter</filter-class> </filter> <filter-mapping> <filter-name>CorsFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> My client

OPTIONS request authentication

阅读更多关于 OPTIONS request authentication

问题 I am developing a web application. It is using Basic authentication. It must process OPTIONS requests. These are web browser preflight requests as well as feature-support requests from WebDAV clients. As far as I understand OPTIONS request must be processed without requesting authentication (that is my server should not respond with 401 Unauthorized), it must give the response such as the following: OPTIONS https://localhost:44305/path/file.ext HTTP/1.1 Connection: Keep-Alive User-Agent: some

Fetch API, custom request headers, CORS, and cross-origin redirects

阅读更多关于 Fetch API, custom request headers, CORS, and cross-origin redirects

问题 I need to make an HTTP GET request with custom request headers in-browser and process the result as it streams in. The Fetch API is ideal for this: fetch('https://example.com/resource', { method: 'GET', headers: { 'X-Brad-Test': 'true' }, cache: 'no-store', mode: 'cors' }).then((res) => { const reader = res.body.getReader(); // etc. }); This works quite well. Since there are custom headers, the browser pre-flights the request with an OPTIONS request to /resource . I have configured my server

Why does a cross-origin HEAD request need a preflight check?

阅读更多关于 Why does a cross-origin HEAD request need a preflight check?

I was reading the spec on CORS requests, and I found this about preflight requests: These are requests to a non same origin URL with an HTTP request method other than GET that first need to be authorized using either a preflight result cache entry or a preflight request. I had thought the purpose of preflight requests was to check whether a request was allowed before making it, in case it (illegitimately) changed server state . But HEAD and OPTIONS don't modify server state. I must misunderstand the reason for preflight check. What is the purpose (aka the reason, motivation, or rationale) for

What are proper status codes for CORS preflight requests?

阅读更多关于 What are proper status codes for CORS preflight requests?

What status code should a well-written HTTP server return when it gets a CORS preflight ( OPTIONS ) request? 200 , 204 or something else? Should the status code be different in case origin is allowed (and corresponding headers will be set) or not allowed (and CORS headers will not be set or will not match the origin)? The gist of it is, just use 200 . A little more generally: You should just send back the same status code for the CORS preflight OPTIONS request that you’d send back for any other OPTIONS request. The relevant specs don’t require or recommend anything more than that. As far the

How to handle preflight CORS requests on a Go server

阅读更多关于 How to handle preflight CORS requests on a Go server

问题 So I'm writing this RESTful backend in Go, which will be called with cross-site HTTP requests, i.e. from content served by another site (actually, just another port, but the same-origin policy kicks in, so here we are). In this scenario, the user agent will, in some cases, send preflight OPTIONS requests to check if the actual request is safe to send. My question is how to best deal with, and adequately respond to, these preflight requests in a Go context. The ways I have conceived don't feel

How to resolve 'preflight is invalid (redirect)' or 'redirect is not allowed for a preflight request'

阅读更多关于 How to resolve 'preflight is invalid (redirect)' or 'redirect is not allowed for a preflight request'

I have followed this step to setup my server to enable CORS. https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api But now in my browser dev console, I see this error message: XMLHttpRequest cannot load https://serveraddress/abc . Response for preflight is invalid (redirect) Do you know what can I do to fix it? I am making a CORS request in HTTPS. I think that is causing the 'preflight is invalid (redirect)' failure. But I don't know why or what is redirecting the OPTIONS request. Thank you. Your code is triggering your browser to send a

Confused about how to handle CORS OPTIONS preflight requests

阅读更多关于 Confused about how to handle CORS OPTIONS preflight requests

问题 I\'m new to working with Cross Origin Resource Sharing and trying to get my webapp to respond to CORS requests. My webapp is a Spring 3.2 app running on Tomcat 7.0.42. In my webapp\'s web.xml, I have enabled the Tomcat CORS filter:   <filter> <filter-name>CorsFilter</filter-name> <filter-class>org.apache.catalina.filters.CorsFilter</filter-class> </filter> <filter

What are proper status codes for CORS preflight requests?

阅读更多关于 What are proper status codes for CORS preflight requests?

问题 What status code should a well-written HTTP server return when it gets a CORS preflight ( OPTIONS ) request? 200 , 204 or something else? Should the status code be different in case origin is allowed (and corresponding headers will be set) or not allowed (and CORS headers will not be set or will not match the origin)? 回答1: The gist of it is, just use 200 . A little more generally: You should just send back the same status code for the CORS preflight OPTIONS request that you’d send back for