API status 200 but with empty body when using HTTP Basic Auth

[Wang ZY]

A confusing problem when using Confluence REST API / SOAP api /json-rpc api ：

when i send a request to a confluence api using http basic authentication , i got http status 200 but with no repsonse body, 

for example, using curl on confluence server and call ../rest/api/accessmode API  for testing , i got some response when using no auth but an empty response body when using HTTP Basic Auth :

curl -i http://localhost:8090/rest/api/accessmode

HTTP/1.1 200 
X-ASEN: SEN-L13792150
Set-Cookie: JSESSIONID=FC801E48AD3BA0A7207D80D10A94D726; Path=/; Secure; HttpOnly
Cache-Control: no-cache, must-revalidate
Expires: Thu, 01 Jan 1970 00:00:00 GMT
X-Content-Type-Options: nosniff
Content-Type: application/json
Transfer-Encoding: chunked
Date: Fri, 12 Jul 2019 10:35:25 GMT

"READ_WRITE"

curl -i -u admin:passwd http://localhost:8090/rest/api/accessmode

HTTP/1.1 200 
X-ASEN: SEN-L13792150
Set-Cookie: JSESSIONID=78A33380D09EFC4511DA4162AD2CD801; Path=/; Secure; HttpOnly
Content-Length: 0
Date: Fri, 12 Jul 2019 10:37:12 GMT

same thing happens when using SOAP or json-rpc API.

In addtion,  we are using Seraph and a customised Authenticator for Single Sing-on and it works well  , is that a possible cause?

or which log should i view to help me solve the problem？

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Confluence server version : 6.15.4

[Thomas Deiler]

Dear @Wang ZY ,

I tried to reproduce what you described. With Confluence 6.15.6. all curl commands worked as expected. Regardless if taking an admin or non-admin account.

Have you already tried with a REST client?

So long

Thomas