# Http.max\_header\_size

**URL:** <https://discuss.elastic.co/t/http-max-header-size/256318>\
**Category:** Elasticsearch\
**Created:** [November 23, 2020, 7:57am UTC](https://discuss.elastic.co/t/http-max-header-size/256318 "2020-11-23T07:57:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thetell75](https://avatars.discourse-cdn.com/v4/letter/t/d9b06d/32.png) [@thetell75](https://discuss.elastic.co/u/thetell75)\
**Post date:** [November 23, 2020, 7:57am UTC](https://discuss.elastic.co/t/http-max-header-size/256318/1 "2020-11-23T07:57:36Z")

</div>

Hello everybody,

I have an issue with User having to many groups on Microsoft Azure. As we do authenticate through openid on Azure. I saw a Problem with Header Size. So I tried to increase the Header\_Size from 8KB to 16KB. But it doesn't work in any way. We have a Deployment on the elastic Cloud, so I only can change such settings through API Console or by editing additional Config part in the web.

If I try through APi with code:

put \_cluster/settings  
{  
"transient" : {  
"http.max\_header\_size" : "16384"  
}  
}

Here i get this error:  
400 — Bad Request

```auto
{
  "status": 400,
  "error": {
    "root_cause": [
      {
        "reason": "transient setting [http.max_header_size], not dynamically updateable",
        "type": "illegal_argument_exception"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "transient setting [http.max_header_size], not dynamically updateable"
  }
}

```

If I try through Additional Config I get an error about that this parameter is not allowed...

So is there a way to increase the Header\_Size? Or do I have to request it at Elastic Support?

Thanks

---

<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [November 23, 2020, 8:18am UTC](https://discuss.elastic.co/t/http-max-header-size/256318/2 "2020-11-23T08:18:42Z")

</div>

Can you share more information about the problem you are seeing. Do you have errors?

---

<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [November 23, 2020, 8:24am UTC](https://discuss.elastic.co/t/http-max-header-size/256318/3 "2020-11-23T08:24:40Z")

</div>

[This is a static setting](https://www.elastic.co/guide/en/elasticsearch/reference/7.9/modules-http.html#_http_settings) so I believe you will need to contact Elastic Cloud support.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 21, 2020, 8:24am UTC](https://discuss.elastic.co/t/http-max-header-size/256318/4 "2020-12-21T08:24:43Z")

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