google chrome - Got 400 error for pre-flight options CORS token request from OWIN-based WebAPI -


it strange.

i tried make cors request webapi2 (owin-based) gain authentication token.

it fails every other times. 1st request fails, 2nd request go through. , 3rd fails, 4th go through.

i don't understand why working half of times.

i check browser request (chrome).

the 1 got failed goes options method. 1 went through goes post.

but use post method headers 'content-type': 'application/x-www-form-urlencoded'

so guess question why sometime chrome/fire fox send preflight request sometime doesn't.

btw, works totally fine in ie.

you correct both chrome , firefox use preflight options request. so, prior executing post, chrome/firefox sends request options verb. if not receive response server tells browser allowed send cross domain request, you'll error , subsequent post not post.

you have enable options in web.config (or using 1 of approaches listed in article): http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api

for web.config try:

<httpprotocol>       <customheaders>         <add name="access-control-allow-origin" value="*" />         <add name="access-control-allow-methods" value="get, post, options,put"/>         <add name="access-control-allow-headers" value="content-type, accept"/>                   </customheaders>

ie has been slow in adopting cors standards, that's why ie working fine without options enabled.


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