I am trying to access a sharepoint server REST api to upload some files. Access is via our tomcat application

Although I believe I setup correctly the headers in IIS the request does not pass the preflight.

Here are the request headers:

Request OPTIONS /_api/contextinfo HTTP/1.1
Accept  */*
Origin  http://localhost:8080
Access-Control-Request-Method   POST
Access-Control-Request-Headers  content-type, accept
Accept-Encoding gzip, deflate
User-Agent  Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; MAAU; rv:11.0) like Gecko
Host    temp-sharepoint
Content-Length  0
Connection  Keep-Alive
Cache-Control   no-cache

and the response headers:

Response    HTTP/1.1 401 Unauthorized
Content-Type    text/plain; charset=utf-8
Server  Microsoft-IIS/7.5
SPRequestGuid   8d690d9d-d06e-101d-6038-8056a7fce7c2
request-id  8d690d9d-d06e-101d-6038-8056a7fce7c2
SPRequestDuration   5
SPIisLatency    1
WWW-Authenticate    Negotiate
WWW-Authenticate    NTLM
X-Powered-By    ASP.NET
X-Content-Type-Options  nosniff
X-MS-InvokeApp  1; RequireReadOnly
Access-Control-Allow-Origin *
Access-Control-Allow-Credentials    true
Access-Control-Allow-Methods    GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Headers    accept,content-type
Date    Fri, 05 Jun 2015 15:52:01 GMT
Content-Length  16

My code to request

var url = sharepointURL + "/_api/contextinfo";
     url: url,
     type: "POST",
        "Accept": "application/json; odata=verbose"
     xhrFields: {
            withCredentials: true
    crossDomain: true,
     contentType: "application/json;odata=verbose",

Why is not passing the preflight? have I misconfigured the headers?

  • 1
    Does anyone know if there is a problem with preflight OPTIONS requests to IIS? the server is to windows Authentication. Do I need to write a custom module to handle OPTIONS otherwise they will always fail? – user42999 Jun 5 '15 at 18:23

For a post you will need to add X-RequestDigest: $("#__REQUESTDIGEST").val() in the header.

  • 1
    Thanks for the answer. Unfortunately it didnt help. Still receiving the same error response and the request never passes preflight – user42999 Jun 5 '15 at 17:26

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