Header

All Known Subinterfaces:

DecodedJWT
```
public interface Header
```
The Header class represents the 1st part of the JWT, where the Header value is held.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`getAlgorithm()`	Getter for the Algorithm "alg" claim defined in the JWT's Header.
`java.lang.String`	`getContentType()`	Getter for the Content Type "cty" claim defined in the JWT's Header.
`Claim`	`getHeaderClaim(java.lang.String name)`	Get a Private Claim given it's name.
`java.lang.String`	`getKeyId()`	Get the value of the "kid" claim, or null if it's not available.
`java.lang.String`	`getType()`	Getter for the Type "typ" claim defined in the JWT's Header.

- Method Detail
  - getAlgorithm
```
java.lang.String getAlgorithm()
```
    Getter for the Algorithm "alg" claim defined in the JWT's Header. If the claim is missing it will return null.
    
    Returns:
    
    the Algorithm defined or null.
  - getType
```
java.lang.String getType()
```
    Getter for the Type "typ" claim defined in the JWT's Header. If the claim is missing it will return null.
    
    Returns:
    
    the Type defined or null.
  - getContentType
```
java.lang.String getContentType()
```
    Getter for the Content Type "cty" claim defined in the JWT's Header. If the claim is missing it will return null.
    
    Returns:
    
    the Content Type defined or null.
  - getKeyId
```
java.lang.String getKeyId()
```
    Get the value of the "kid" claim, or null if it's not available.
    
    Returns:
    
    the Key ID value or null.
  - getHeaderClaim
```
Claim getHeaderClaim(java.lang.String name)
```
    Get a Private Claim given it's name. If the Claim wasn't specified in the Header, a 'null claim' will be returned. All the methods of that claim will return null.
    
    Parameters:
    
    name - the name of the Claim to retrieve.
    
    Returns:
    
    a non-null Claim.