MadelineProtoDocs/old_docs/API_docs_v82/methods/initConnection.md

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---
title: initConnection
description: Initializes connection and save information on the user's device and application.
image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
---
# Method: initConnection
[Back to methods index](index.md)
Initializes connection and save information on the user's device and application.
### Parameters:
| Name | Type | Description | Required |
|----------|---------------|-------------|----------|
|api\_id|[int](../types/int.md) | Application identifier | Yes|
|device\_model|[string](../types/string.md) | Device model | Yes|
|system\_version|[string](../types/string.md) | System version | Yes|
|app\_version|[string](../types/string.md) | App version | Yes|
|system\_lang\_code|[string](../types/string.md) | Language code | Yes|
|lang\_pack|[string](../types/string.md) | Language pack to use | Yes|
|lang\_code|[string](../types/string.md) | Language code to set | Yes|
|proxy|[InputClientProxy](../types/InputClientProxy.md) | The current proxy | Optional|
|query|[!X](../types/!X.md) | Nested query | Yes|
### Return type: [X](../types/X.md)
### Can bots use this method: **YES**
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### MadelineProto Example ([now async for huge speed and parallelism!](https://docs.madelineproto.xyz/docs/ASYNC.html)):
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```php
if (!file_exists('madeline.php')) {
copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';
$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();
$X = $MadelineProto->initConnection(['api_id' => int, 'device_model' => 'string', 'system_version' => 'string', 'app_version' => 'string', 'system_lang_code' => 'string', 'lang_pack' => 'string', 'lang_code' => 'string', 'proxy' => InputClientProxy, 'query' => !X, ]);
```
Or, if you're into Lua:
```lua
X = initConnection({api_id=int, device_model='string', system_version='string', app_version='string', system_lang_code='string', lang_pack='string', lang_code='string', proxy=InputClientProxy, query=!X, })
```
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### Errors
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| Code | Type | Description |
|------|----------|---------------|
|400|CONNECTION_LAYER_INVALID|Layer invalid|
|400|INPUT_FETCH_FAIL|Failed deserializing TL payload|
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