# ResponseBody
> Retains failures from streaming read() and eof() calls that an emitter may consume.
[API reference](/docs/api/index.md) › [RoadRunner](/docs/extensions/road-runner/reference/index.md) › ResponseBody
| final class | `yii2\extensions\roadrunner\ResponseBody` |
| --- | --- |
| Implements | `Psr\Http\Message\StreamInterface` |
| Source | [`src/ResponseBody.php`](https://github.com/yii2-extensions/road-runner/blob/main/src/ResponseBody.php#L13) |
Retains failures from streaming `read()` and `eof()` calls that an emitter may consume.
## Methods
| Method | Description | Defined by |
| --- | --- | --- |
| [`__construct()`](#method-__construct) | | `ResponseBody` |
| [`__toString()`](#method-__toString) | | `ResponseBody` |
| [`close()`](#method-close) | | `ResponseBody` |
| [`detach()`](#method-detach) | | `ResponseBody` |
| [`eof()`](#method-eof) | | `ResponseBody` |
| [`getContents()`](#method-getContents) | | `ResponseBody` |
| [`getFailure()`](#method-getFailure) | Returns the failure even when the emitter returned normally after consuming it. | `ResponseBody` |
| [`getMetadata()`](#method-getMetadata) | | `ResponseBody` |
| [`getSize()`](#method-getSize) | | `ResponseBody` |
| [`isReadable()`](#method-isReadable) | | `ResponseBody` |
| [`isSeekable()`](#method-isSeekable) | | `ResponseBody` |
| [`isWritable()`](#method-isWritable) | | `ResponseBody` |
| [`read()`](#method-read) | | `ResponseBody` |
| [`rewind()`](#method-rewind) | | `ResponseBody` |
| [`seek()`](#method-seek) | | `ResponseBody` |
| [`tell()`](#method-tell) | | `ResponseBody` |
| [`write()`](#method-write) | | `ResponseBody` |
## Method details
### __construct()
```php
public function __construct(Psr\Http\Message\StreamInterface $stream)
```
**Parameters**
| Parameter | Type | Description |
| --- | --- | --- |
| `$stream` | `Psr\Http\Message\StreamInterface` | |
### __toString()
```php
public function __toString(): string
```
**Returns**
`string`
### close()
```php
public function close(): void
```
### detach()
```php
public function detach(): resource|null
```
**Returns**
`resource|null`
### eof()
```php
public function eof(): bool
```
**Returns**
`bool`
### getContents()
```php
public function getContents(): string
```
**Returns**
`string`
### getFailure()
```php
public function getFailure(): Throwable|null
```
Returns the failure even when the emitter returned normally after consuming it.
**Returns**
[`Throwable`](https://www.php.net/manual/en/class.throwable.php)`|null`
### getMetadata()
```php
public function getMetadata(string|null $key = null): mixed
```
**Parameters**
| Parameter | Type | Description |
| --- | --- | --- |
| `$key` | `string\|null` | |
**Returns**
`mixed`
### getSize()
```php
public function getSize(): int|null
```
**Returns**
`int|null`
### isReadable()
```php
public function isReadable(): bool
```
**Returns**
`bool`
### isSeekable()
```php
public function isSeekable(): bool
```
**Returns**
`bool`
### isWritable()
```php
public function isWritable(): bool
```
**Returns**
`bool`
### read()
```php
public function read(int $length): string
```
**Parameters**
| Parameter | Type | Description |
| --- | --- | --- |
| `$length` | `int` | |
**Returns**
`string`
### rewind()
```php
public function rewind(): void
```
### seek()
```php
public function seek(int $offset, int $whence = \yii2\extensions\roadrunner\SEEK_SET): void
```
**Parameters**
| Parameter | Type | Description |
| --- | --- | --- |
| `$offset` | `int` | |
| `$whence` | `int` | |
### tell()
```php
public function tell(): int
```
**Returns**
`int`
### write()
```php
public function write(string $string): int
```
**Parameters**
| Parameter | Type | Description |
| --- | --- | --- |
| `$string` | `string` | |
**Returns**
`int`