# BadRequestError: BadRequestError(400, 'media\_type\_header\_exception', 'Invalid media-type value on headers \[Accept, Content-Type\]')

**URL:** <https://discuss.elastic.co/t/badrequesterror-badrequesterror-400-media-type-header-exception-invalid-media-type-value-on-headers-accept-content-type/378116>\
**Category:** Elasticsearch\
**Created:** [May 14, 2025, 5:22am UTC](https://discuss.elastic.co/t/badrequesterror-badrequesterror-400-media-type-header-exception-invalid-media-type-value-on-headers-accept-content-type/378116 "2025-05-14T05:22:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![drake\_boob](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/drake_boob/32/143074_2.png) [@drake\_boob](https://discuss.elastic.co/u/drake_boob)\
**Post date:** [May 14, 2025, 5:22am UTC](https://discuss.elastic.co/t/badrequesterror-badrequesterror-400-media-type-header-exception-invalid-media-type-value-on-headers-accept-content-type/378116/1 "2025-05-14T05:22:33Z")

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In data bricks , I have been elastic 9.0 for year now , but recently i got this error [BadRequestError: BadRequestError(400, 'media\_type\_header\_exception', 'Invalid media-type value on headers [Accept, Content-Type]') ] , i don't know why am getting this error , when ever i try to create any index or update existing index am getting this error . but when i do same thing in my VM its working well . OS need some one help on this .

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**Author:** ![wildone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/wildone/32/143949_2.png) [@wildone](https://discuss.elastic.co/u/wildone)\
**Post date:** [July 25, 2025, 10:05am UTC](https://discuss.elastic.co/t/badrequesterror-badrequesterror-400-media-type-header-exception-invalid-media-type-value-on-headers-accept-content-type/378116/2 "2025-07-25T10:05:51Z")

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Yep thats a feature from 2 years ago to fix add default options... (bonus to turn-off instrumentation) 🙆‍♂️

```auto
RequestOptions.Builder restClientOptionsBuilder = RequestOptions.DEFAULT.toBuilder();

restClientOptionsBuilder
        .addHeader(HttpHeaders.CONTENT_TYPE, "application/json")
        .addHeader(HttpHeaders.ACCEPT, "application/json")
        .addHeader("X-Elastic-Product", "Elasticsearch");

RestClientOptions restClientOptions = new RestClientOptions.Builder(restClientOptionsBuilder).build();

transport = new RestClientTransport(restClient, new JacksonJsonpMapper(), restClientOptions, NoopInstrumentation.INSTANCE);

```