# Client Class Documentation
The following parameters are configurable for the API Client:
| Parameter | Type | Description |
| --- | --- | --- |
| `timeout` | `number` | Timeout for API calls.<br>*Default*: `0` |
| `httpClientOptions` | `Partial<HttpClientOptions>` | Stable configurable http client options. |
| `unstableHttpClientOptions` | `any` | Unstable configurable http client options. |
| `customHeaderAuthenticationCredentials` | [`CustomHeaderAuthenticationCredentials`](auth/custom-header-signature.md) | The credential object for customHeaderAuthentication |
## HttpClientOptions
| Parameter | Type | Description |
| --- | --- | --- |
| `timeout` | `number` | Timeout in milliseconds. |
| `httpAgent` | `any` | Custom http agent to be used when performing http requests. |
| `httpsAgent` | `any` | Custom https agent to be used when performing http requests. |
| `retryConfig` | `Partial<RetryConfiguration>` | Configurations to retry requests. |
## RetryConfiguration
| Parameter | Type | Description |
| --- | --- | --- |
| `maxNumberOfRetries` | `number` | Maximum number of retries. <br> *Default*: `0` |
| `retryOnTimeout` | `boolean` | Whether to retry on request timeout. <br> *Default*: `true` |
| `retryInterval` | `number` | Interval before next retry. Used in calculation of wait time for next request in case of failure. <br> *Default*: `1` |
| `maximumRetryWaitTime` | `number` | Overall wait time for the requests getting retried. <br> *Default*: `0` |
| `backoffFactor` | `number` | Used in calculation of wait time for next request in case of failure. <br> *Default*: `2` |
| `httpStatusCodesToRetry` | `number[]` | Http status codes to retry against. <br> *Default*: `[408, 413, 429, 500, 502, 503, 504, 521, 522, 524, 408, 413, 429, 500, 502, 503, 504, 521, 522, 524, 408, 413, 429, 500, 502, 503, 504, 521, 522, 524]` |
| `httpMethodsToRetry` | `HttpMethod[]` | Http methods to retry against. <br> *Default*: `['GET', 'PUT', 'GET', 'PUT', 'GET', 'PUT']` |
The API client can be initialized as follows:
```ts
const client = new Client({
customHeaderAuthenticationCredentials: {
'Authorization': 'Authorization'
},
timeout: 0,
});
```
## Apimatic API Client
The gateway for the SDK. This class acts as a factory for the Controllers and also holds the configuration of the SDK.
## Controllers
| Name | Description |
| --- | --- |
| apisManagement | Gets ApisManagementController |
| codeGenerationImportedApis | Gets CodeGenerationImportedApisController |
| codeGenerationExternalApis | Gets CodeGenerationExternalApisController |
| transformation | Gets TransformationController |
| docsPortalManagement | Gets DocsPortalManagementController |
| aPIValidationImportedApis | Gets APIValidationImportedApisController |
| aPIValidationExternalApis | Gets APIValidationExternalApisController |
| docsPortalGenerationAsync | Gets DocsPortalGenerationAsyncController |
