I'm having trouble setting up the WebAPI for use with Grafana (v5.2.2). When I try to setup the Data Source with the below parameters (screenshot attached):

URL:    http://fahad-dell-desktop.fy.it.cx:8100/    (I have set it to use 8100 during setup. )
Access: Server (default)
Basic Auth (checked)
With Credentials (checked)
(all SSL/TLS related options unchecked)
User: admin
Password: <entered correctly>

I ran a packet capture on my Grafana server to capture the request and response and they are posted below:

Request:

POST /sessions HTTP/1.1
Host: fahad-dell-desktop.fy.it.cx:8100
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.42 Safari/537.36
Content-Length: 0
Accept: application/json, text/plain, */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9,fr;q=0.8
Authorization: Basic <Hash Removed form Post>
Content-Type: application/json;charset=utf-8
Origin: http://ubuntu-server.fy.it.cx:3100
Referer: http://ubuntu-server.fy.it.cx:3100/datasources/edit/1
X-Forwarded-For: 192.168.100.202, 192.168.100.202
X-Grafana-Nocache: true
X-Grafana-Org-Id: 1

Response

HTTP/1.1 405 HTTP method POST is not supported by this URL
Date: Tue, 21 Aug 2018 12:07:27 GMT
Content-Type: text/html; charset=ISO-8859-1
Cache-Control: must-revalidate,no-cache,no-store
Content-Length: 364
Server: Jetty(9.2.19.v20160908)

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Error 405 HTTP method POST is not supported by this URL</title>
</head>
<body><h2>HTTP ERROR 405</h2>
<p>Problem accessing /sessions. Reason:
<pre>    HTTP method POST is not supported by this URL</pre></p><hr><i><small>Powered by Jetty://</small></i><hr/>

</body>
</html>

It's evident that Grafana is correctly trying to Post to the /sessions URL (as mentioned in the wiki https://wiki.netxms.org/wiki/Web_service_API) but the WebAPI is saying POST is not an allowed method for /sessions.

UPDATE
OK so it turns out my Web API war file wasn't set up correctnly (typo in jetty-web.xml). Fixing that resolved the issue.