---
title: HTTP Meta Data
description: By default, the client sends some meta data about the HTTP connection using custom headers. You can disable or enable it using the following methods: 
url: https://www.elastic.co/docs/reference/elasticsearch/clients/php/http-meta-data
products:
  - Elasticsearch
  - Elasticsearch Client
  - Elasticsearch PHP Client
---

# HTTP Meta Data
By default, the client sends some meta data about the HTTP connection using custom headers.
You can disable or enable it using the following methods:

## Elastic Meta Header

The client sends a `x-elastic-client-meta` header by default. This header is used to collect meta data about the versions of the components used by the client. For instance, a value of `x-elastic-client-meta` can be `es=8.0.0-s,php=8.0.0,t=8.0.0-s,a=0,gu=7.4.2, where each value is the version of `es=Elasticsearch`, `t`is the transport version (same of client),`a` is asyncronouts (`0=false`by default) and`gu=Guzzle`.
If you would like to disable it you can use the `setElasticMetaHeader()` method, as follows:
```php
$client = Elasticsearch\ClientBuilder::create()
    ->setElasticMetaHeader(false)
    ->build();
```