Dashboard error "Unexpected token < in JSON at position 0"

Elastic Stack Kibana
1

Hi

I am having errors seeing the dashboard in kibana, I am getting several frames with the error "unexpected token <in JSON at position 0"

Then I refresh the page and they don't appear anymore so I think it's not a query or a display error

image
image1919×916 179 KB

image
image1918×908 115 KB

We have Kibana 7.6.1.

Do you know how I can solve it?

2

It seems like the request to the server is failing for some reason - are you using a proxy of some kind in front of Kibana?

Could you open the network tab in the dev tools and try to get the error by refreshing a few times? If that works could you copy/paste the request and the response which are causing the problem (they should have a status code >= 400)?

3

Hi

We use apache proxy

the error appears and this is what is sent in the request and in the response.

status code 502

Request URL:

https://bs2.openpartner.cl/kibana/s/gildemeister/elasticsearch/gdm_journal_0.4/_search?rest_total_hits_as_int=true&ignore_unavailable=true&ignore_throttled=true&preference=1585326865524&timeout=30000ms

Response

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>502 Bad Gateway</title>
</head><body>
<h1>Bad Gateway</h1>
<p>The proxy server received an invalid
response from an upstream server.<br />
</p>
<hr>
<address>Apache/2.4.41 (Ubuntu) Server at bs2.openpartner.cl Port 443</address>
</body></html>

image
image1908×943 170 KB

image
image1078×906 54.9 KB

4

Can you share your proxy configuration? Looks like something is misconfigured in there.

5

Of course, we have in the proxy

<Location /kibana>
                ProxyPass         http://localhost:5601 
                ProxyPassReverse  http://localhost:5601
        </Location>

and kibana.yml server.basePath: "/kibana"

6

I had same probleme and i just solved it now, in my case the error came from my proxy where i had :

ProxyPass               /elastic_search   http://127.0.0.1:9200
ProxyPassReverse        /elastic_search   http://127.0.0.1:9200

and just by removing it, it works !

7

Delete elastic_search in my proxy but it still doesn't work

8

Can you turn on verbose logging on the proxy server and check what exactly the problem is? Also, the complete configuration would be helpful.

9

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.