# I am making custom esClient in kibana to use API of elasticsearch . i dont wan't to use a kibana's ecClient

**URL:** <https://discuss.elastic.co/t/i-am-making-custom-esclient-in-kibana-to-use-api-of-elasticsearch-i-dont-want-to-use-a-kibanas-ecclient/126381>\
**Category:** Elasticsearch\
**Created:** [April 2, 2018, 7:30am UTC](https://discuss.elastic.co/t/i-am-making-custom-esclient-in-kibana-to-use-api-of-elasticsearch-i-dont-want-to-use-a-kibanas-ecclient/126381 "2018-04-02T07:30:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ashutoshningot](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ashutoshningot/32/26031_2.png) [@ashutoshningot](https://discuss.elastic.co/u/ashutoshningot)\
**Post date:** [April 2, 2018, 7:30am UTC](https://discuss.elastic.co/t/i-am-making-custom-esclient-in-kibana-to-use-api-of-elasticsearch-i-dont-want-to-use-a-kibanas-ecclient/126381/1 "2018-04-02T07:30:29Z")

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pre-flight request is giving: 200  
CORS ERROR: Reson "kbn-version and content-type missing".

HOW TO PROCCED?

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**Author:** ![Samreen\_Zeeshan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/samreen_zeeshan/32/22264_2.png) [@Samreen\_Zeeshan](https://discuss.elastic.co/u/Samreen_Zeeshan)\
**Post date:** [April 27, 2018, 1:46pm UTC](https://discuss.elastic.co/t/i-am-making-custom-esclient-in-kibana-to-use-api-of-elasticsearch-i-dont-want-to-use-a-kibanas-ecclient/126381/2 "2018-04-27T13:46:15Z")

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I am having the same error when try to send a POST request via Firefox but in chrome it works fine.

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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:** [May 25, 2018, 1:46pm UTC](https://discuss.elastic.co/t/i-am-making-custom-esclient-in-kibana-to-use-api-of-elasticsearch-i-dont-want-to-use-a-kibanas-ecclient/126381/3 "2018-05-25T13:46:18Z")

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