Added in [API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [S Extensions 7](https://developer.android.com/sdkExtensions) Summary: [Ctors](https://developer.android.com/reference/android/net/http/HeaderBlock#pubctors) \| [Methods](https://developer.android.com/reference/android/net/http/HeaderBlock#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/android/net/http/HeaderBlock#inhmethods)

# HeaderBlock

*** ** * ** ***


`
public


abstract
class
HeaderBlock
`


`

extends https://developer.android.com/reference/java/lang/Object


`

`


`

|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.net.http.HeaderBlock |

<br />

*** ** * ** ***

Unmodifiable container of headers or trailers.

## Summary

| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/android/net/http/HeaderBlock#HeaderBlock()() ` |

| ### Public methods ||
|---|---|
| ` abstract https://developer.android.com/reference/java/util/List<https://developer.android.com/reference/java/util/Map.Entry<https://developer.android.com/reference/java/lang/String, https://developer.android.com/reference/java/lang/String>>` | ` https://developer.android.com/reference/android/net/http/HeaderBlock#getAsList()() ` Returns an unmodifiable list of the header field and value pairs. |
| ` abstract https://developer.android.com/reference/java/util/Map<https://developer.android.com/reference/java/lang/String, https://developer.android.com/reference/java/util/List<https://developer.android.com/reference/java/lang/String>>` | ` https://developer.android.com/reference/android/net/http/HeaderBlock#getAsMap()() ` Returns an unmodifiable map from header field names to lists of values. |

| ### Inherited methods |
|---|---|
| From class ` https://developer.android.com/reference/java/lang/Object ` |---|---| | ` https://developer.android.com/reference/java/lang/Object` | ` https://developer.android.com/reference/java/lang/Object#clone()() ` Creates and returns a copy of this object. | | ` boolean` | ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` https://developer.android.com/reference/java/lang/Object#finalize()() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final https://developer.android.com/reference/java/lang/Class<?>` | ` https://developer.android.com/reference/java/lang/Object#getClass()() ` Returns the runtime class of this `Object`. | | ` int` | ` https://developer.android.com/reference/java/lang/Object#hashCode()() ` Returns a hash code value for the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notify()() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notifyAll()() ` Wakes up all threads that are waiting on this object's monitor. | | ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/Object#toString()() ` Returns a string representation of the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait()() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||

## Public constructors

### HeaderBlock

Added in [API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [S Extensions 7](https://developer.android.com/sdkExtensions)

```
public HeaderBlock ()
```

<br />

<br />

## Public methods

### getAsList

Added in [API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [S Extensions 7](https://developer.android.com/sdkExtensions)

```
public abstract List<Entry<String, String>> getAsList ()
```

Returns an unmodifiable list of the header field and value pairs.
For response, the headers are in the same order they are received over the wire.
For request, the headers are in the same order they are added.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/List<https://developer.android.com/reference/java/util/Map.Entry<https://developer.android.com/reference/java/lang/String, https://developer.android.com/reference/java/lang/String>>` | an unmodifiable list of header field and value pairs. This value cannot be `null`. <br /> |

### getAsMap

Added in [API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [S Extensions 7](https://developer.android.com/sdkExtensions)

```
public abstract Map<String, List<String>> getAsMap ()
```

Returns an unmodifiable map from header field names to lists of values.
Order of each list of values for a single header field is:
For response, the same order they were received over the wire.
For request, the same order they were added.
The iteration order of keys is unspecified.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Map<https://developer.android.com/reference/java/lang/String, https://developer.android.com/reference/java/util/List<https://developer.android.com/reference/java/lang/String>>` | an unmodifiable map from header field names to lists of values. This value cannot be `null`. <br /> |