java.lang.Object
- org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
- - org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
  - - org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver
    - - org.springframework.web.reactive.result.method.annotation.RequestHeaderMethodArgumentResolver

All Implemented Interfaces:
HandlerMethodArgumentResolver, SyncHandlerMethodArgumentResolver
```
public class RequestHeaderMethodArgumentResolver
extends AbstractNamedValueSyncArgumentResolver
```
Resolves method arguments annotated with @RequestHeader except for Map arguments. See RequestHeaderMapMethodArgumentResolver for details on Map arguments annotated with @RequestHeader.
An @RequestHeader is a named value resolved from a request header. It has a required flag and a default value to fall back on when the request header does not exist.
A ConversionService is invoked to apply type conversion to resolved request header values that don't yet match the method parameter type.
Since:
5.0
Author:
Rossen Stoyanchev
See Also:
RequestHeaderMapMethodArgumentResolver

Nested Class Summary
- Nested classes/interfaces inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
  AbstractNamedValueArgumentResolver.NamedValueInfo

Field Summary
- Fields inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
  logger

Constructor Summary

Constructors
Constructor	Description
`RequestHeaderMethodArgumentResolver(ConfigurableBeanFactory factory, ReactiveAdapterRegistry registry)`	Create a new `RequestHeaderMethodArgumentResolver` instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected AbstractNamedValueArgumentResolver.NamedValueInfo`	`createNamedValueInfo(MethodParameter parameter)`	Create the `AbstractNamedValueArgumentResolver.NamedValueInfo` object for the given method parameter.
`protected void`	`handleMissingValue(String name, MethodParameter parameter)`	Invoked when a named value is required, but `AbstractNamedValueArgumentResolver.resolveName(String, MethodParameter, ServerWebExchange)` returned `null` and there is no default value.
`protected Object`	`resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange)`	Actually resolve the value synchronously.
`boolean`	`supportsParameter(MethodParameter param)`	Whether this resolver supports the given method parameter.

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver
resolveArgument, resolveArgumentValue, resolveName

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
handleMissingValue, handleResolvedValue

Methods inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
checkAnnotatedParamNoReactiveWrapper, checkParameterType, checkParameterTypeNoReactiveWrapper, getAdapterRegistry

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RequestHeaderMethodArgumentResolver
```
public RequestHeaderMethodArgumentResolver(@Nullable
                                           ConfigurableBeanFactory factory,
                                           ReactiveAdapterRegistry registry)
```
    Create a new RequestHeaderMethodArgumentResolver instance.
    Parameters:
    factory - a bean factory to use for resolving ${...} placeholder and #{...} SpEL expressions in default values; or null if default values are not expected to have expressions
    registry - for checking reactive type wrappers
- Method Detail
  - supportsParameter
```
public boolean supportsParameter(MethodParameter param)
```
    Description copied from interface: HandlerMethodArgumentResolver
    Whether this resolver supports the given method parameter.
    Parameters:
    param - the method parameter
  - createNamedValueInfo
```
protected AbstractNamedValueArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)
```
    Description copied from class: AbstractNamedValueArgumentResolver
    Create the AbstractNamedValueArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).
    Specified by:
    createNamedValueInfo in class AbstractNamedValueArgumentResolver
    Parameters:
    parameter - the method parameter
    Returns:
    the named value information
  - resolveNamedValue
```
protected Object resolveNamedValue(String name,
                                   MethodParameter parameter,
                                   ServerWebExchange exchange)
```
    Description copied from class: AbstractNamedValueSyncArgumentResolver
    Actually resolve the value synchronously.
    Specified by:
    resolveNamedValue in class AbstractNamedValueSyncArgumentResolver
  - handleMissingValue
```
protected void handleMissingValue(String name,
                                  MethodParameter parameter)
```
    Description copied from class: AbstractNamedValueArgumentResolver
    Invoked when a named value is required, but AbstractNamedValueArgumentResolver.resolveName(String, MethodParameter, ServerWebExchange) returned null and there is no default value. Subclasses typically throw an exception in this case.
    Overrides:
    handleMissingValue in class AbstractNamedValueArgumentResolver
    Parameters:
    name - the name for the value
    parameter - the method parameter

Class RequestHeaderMethodArgumentResolver

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

Field Summary

Fields inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

Constructor Summary

Method Summary

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

Methods inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

Methods inherited from class java.lang.Object

Constructor Detail

RequestHeaderMethodArgumentResolver

Method Detail

supportsParameter

createNamedValueInfo

resolveNamedValue

handleMissingValue