`UserInfo` endpoint lookup never returns

As part of the OIDC login flow, during the backchannel exchange to get the access and id token (assuming you are in the auth code flow, but that's not relevant to the issue), one can perform a check against the UserInfo endpoint of the OIDC provider to check that the sub claim of the obtained ID token matches the one of the userinfo associated to the access token.

However, in the case of NSS, a lookup at https://inrupt.net/.well-known/openid-configuration shows that the userinfo endpoint exists, but a GET to https://inrupt.net/userinfo just hangs, and never get either a success or an error response. This prevents proper functioning of some OIDC libraries, and requires to be worked around. Should this be fixed in the NSS repo, or rather at the oidc-op level ?

复现 https://inrupt.net/userinfo 上挂起的 GET 请求，并将其与 https://inrupt.net/.well-known/openid-configuration 中公布的端点进行比较。跟踪确定 UserInfo 行为由 NSS 还是 oidc-op 负责；完成的标准是该端点返回成功响应或错误响应，使 OIDC 库能够完成验证。