Why browser do not follow redirects using XMLHTTPRequest and CORS?
Solution 1
I've been wrestling with this, too. It appears that 3xx redirects for preflighted CORS requests are forbidden by the spec.
From the spec:
(Step 1. and 2. detail the preflighting process. And the we come to step...)
...3. This is the actual request. Apply the make a request steps and observe the request rules below while making the request.
If the response has an HTTP status code of 301, 302, 303, 307, or 308 Apply the cache and network error steps.
And then if we scroll on down to http://www.w3.org/TR/cors/#cache-and-network-error-steps:
Whenever the network error steps are applied, terminate the algorithm that invoked this set of steps and set the cross-origin request status to network error.
Note: This has no effect on setting of user credentials. I.e. if the block cookies flag is unset, cookies will be set by the response.
Whenever the cache and network error steps are applied, follow these steps:
Remove the entries in the preflight result cache where origin field value is a case-sensitive match for source origin and url field value is a case-sensitive match for request URL.
Apply the network error steps acting as if the algorithm that invoked the cache and network error steps invoked the network error steps instead.
(Emphasis taken from the doc.)
3xx redirects are, however, permitted for simple CORS requests.
Solution 2
If its the chromium bug here is the possible errors on your code given by chromium suport:
If a same-origin request causes a redirect to a different origin,
do not enforce access control checks for the redirect response
itself, because the request which resulted in the redirect was
same-origin.If a same-origin request causes a redirect to a different origin,
use the original request's URL as the origin for the new request do not use a unique security origin.Track whether the client (i.e., XMLHttpRequest) actually requested
that credentials be sent in the first place. When a same-origin request redirects to a different origin, the original request will send cookies whether requested or not, because it is same-origin. The new cross-origin request should not send cookies unless they were requested, so that the access control checks on the response will succeed if the server granted "Access-Control-Allow-Origin=*".
galadog
Updated on June 05, 2022Comments
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galadog almost 2 years
I am writing a web application for some service using RESTful API. The API is available at
https://api.example
and app athttps://app.example
. Simple GET requests using CORS are working just fine in Chrome and Firefox. Some method accept data via POST and return 303 code with new uri in Location header.Preflight OPTIONS request is fine:
Request Method:OPTIONS Status Code:200 OK
Request Headers
Accept:*/* Accept-Charset:UTF-8,*;q=0.5 Accept-Encoding:gzip,deflate,sdch Accept-Language:en-US,en;q=0.8,ru;q=0.6 Access-Control-Request-Headers:origin, authorization, content-type Access-Control-Request-Method:POST Connection:keep-alive DNT:1 Host:api.example Origin:https://app.example Referer:https://app.example/app/ User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.32 (KHTML, like Gecko) Chrome/27.0.1425.0 Safari/537.32 SUSE/27.0.1425.0
Response Headers
Access-Control-Allow-Credentials:true Access-Control-Allow-Headers:Authorization, Content-Type Access-Control-Allow-Methods:GET,POST,PUT,DELETE,HEAD,OPTIONS Access-Control-Allow-Origin:https://app.example Access-Control-Expose-Headers:* Access-Control-Max-Age:3628800 Connection:keep-alive Content-Length:0 Date:Sun, 05 May 2013 15:22:50 GMT Server:nginx/1.2.5
Then the actual request just stop after receiving 303:
Request URL:https://api.example Request Method:POST Status Code:HTTP/1.1 303 See Other
Response headers:
Server:nginx/1.2.5 Location:https://api.example/some_url Date:Sun, 05 May 2013 15:27:49 GMT Content-Type:application/json Content-Length:0 Connection:keep-alive Access-Control-Max-Age:3628800 Access-Control-Expose-Headers:* Access-Control-Allow-Origin:https://app.example Access-Control-Allow-Methods:GET,POST,PUT,DELETE,HEAD,OPTIONS Access-Control-Allow-Headers:Authorization, Content-Type Access-Control-Allow-Credentials:true
By RFC user agent should follow redirects, but Chrome and FF seems doesn't behave as expected. Is it a browsers' bug or I am doing something wrong?
update: If I start chromium with --disable-web-security everything works fine.
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Matthias over 10 yearsI believe his problem was not involving a same-origin request. It was a cross-origin request having a 302 response.
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sideshowbarker over 5 yearsNote that the current CORS spec, which is part of fetch.spec.whatwg.org, does now allow redirects to be followed after a preflight. For further details, see the answer at stackoverflow.com/questions/34949492/…