# Errors related to http requests

**URL:** <https://discuss.elastic.co/t/errors-related-to-http-requests/216515>\
**Category:** Elasticsearch\
**Created:** [January 25, 2020, 11:33am UTC](https://discuss.elastic.co/t/errors-related-to-http-requests/216515 "2020-01-25T11:33:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![George\_Wainwright](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/george_wainwright/32/51054_2.png) [@George\_Wainwright](https://discuss.elastic.co/u/George_Wainwright)\
**Post date:** [January 25, 2020, 11:33am UTC](https://discuss.elastic.co/t/errors-related-to-http-requests/216515/1 "2020-01-25T11:33:02Z")

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Hello,

from time to time I see the next errors among elasticsearch logs:

[2020-01-25T01:20:41,285][ERROR][o.e.r.RestController] failed to send failure response for uri [/]  
java.lang.IllegalArgumentException: Unexpected http method: PROPFIND  
Suppressed: java.lang.IllegalArgumentException: Unexpected http method: PROPFIND  
Suppressed: java.lang.IllegalArgumentException: Unexpected http method: SEARCH  
[2020-01-25T01:20:48,805][ERROR][o.e.r.RestController] failed to send failure response for uri [/]  
[2020-01-25T01:20:49,098][ERROR][o.e.r.RestController] failed to send failure response for uri [/Nessus598570297.html]  
java.lang.IllegalArgumentException: Unexpected http method: TRACK

I don't use SSL in Elasticsearch.

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**Author:** ![Armin\_Braun](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/armin_braun/32/20092_2.png) [@Armin\_Braun](https://discuss.elastic.co/u/Armin_Braun)\
**Post date:** [January 25, 2020, 2:18pm UTC](https://discuss.elastic.co/t/errors-related-to-http-requests/216515/2 "2020-01-25T14:18:03Z")

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Hi @George_Wainwright

it looks like some client that is not a proper ES client is trying to communicate with ES.

> [@George\_Wainwright](#):
>
> [2020-01-25T01:20:49,098][ERROR][o.e.r.RestController] failed to send failure response for uri [/Nessus598570297.html]

This URL looks fairly specific. Maybe you can use it to understand who or what is sending those requests. The fact that ES is logging errors here is due to a bug in ES related to handling unknown/broken HTTP methods that we fixed [here](https://github.com/elastic/elasticsearch/pull/43362).

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**Author:** ![George\_Wainwright](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/george_wainwright/32/51054_2.png) [@George\_Wainwright](https://discuss.elastic.co/u/George_Wainwright)\
**Post date:** [January 26, 2020, 10:08am UTC](https://discuss.elastic.co/t/errors-related-to-http-requests/216515/3 "2020-01-26T10:08:21Z")

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Hi @Armin_Braun,

thank you so much for providing with version in which it was fixed.

Regarding that failed URI you were right. It appeared that it was Nessus security software.

Thanks again for your help.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 23, 2020, 10:08am UTC](https://discuss.elastic.co/t/errors-related-to-http-requests/216515/4 "2020-02-23T10:08:27Z")

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