Package org.springframework.web.servlet.resource

Class EncodedResourceResolver

java.lang.Object

org.springframework.web.servlet.resource.AbstractResourceResolver

org.springframework.web.servlet.resource.EncodedResourceResolver

All Implemented Interfaces:

ResourceResolver

public class EncodedResourceResolver
extends AbstractResourceResolver

Resolver that delegates to the chain, and if a resource is found, it then attempts to find an encoded (e.g. gzip, brotli) variant that is acceptable based on the "Accept-Encoding" request header.

The list of supported contentCodings can be configured, in order of preference, and each coding must be associated with extensions.

Note that this resolver must be ordered ahead of a VersionResourceResolver with a content-based, version strategy to ensure the version calculation is not impacted by the encoding.

Since:

5.1

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field	Description
static final List<String>	DEFAULT_CODINGS	The default content codings.

Fields inherited from class org.springframework.web.servlet.resource.AbstractResourceResolver

logger

Constructor Summary

Constructors

Constructor	Description
EncodedResourceResolver()

Method Summary

Modifier and Type	Method	Description
List<String>	getContentCodings()	Return a read-only list with the supported content codings.
Map<String,String>	getExtensions()	Return a read-only map with coding-to-extension mappings.
void	registerExtension(String coding, String extension)	Java config friendly alternative to setExtensions(Map).
protected Resource	resolveResourceInternal(HttpServletRequest request, String requestPath, List<? extends Resource> locations, ResourceResolverChain chain)
protected String	resolveUrlPathInternal(String resourceUrlPath, List<? extends Resource> locations, ResourceResolverChain chain)
void	setContentCodings(List<String> codings)	Configure the supported content codings in order of preference.
void	setExtensions(Map<String,String> extensions)	Configure mappings from content codings to file extensions.

Methods inherited from class org.springframework.web.servlet.resource.AbstractResourceResolver

resolveResource, resolveUrlPath

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_CODINGS

public static final List<String> DEFAULT_CODINGS

The default content codings.

Constructor Details

EncodedResourceResolver

public EncodedResourceResolver()

Method Details

setContentCodings

public void setContentCodings(List<String> codings)

Configure the supported content codings in order of preference. The first coding that is present in the "Accept-Encoding" header for a given request, and that has a file present with the associated extension, is used.

Note: Each coding must be associated with a file extension via registerExtension(java.lang.String, java.lang.String) or setExtensions(java.util.Map<java.lang.String, java.lang.String>). Also customizations to the list of codings here should be matched by customizations to the same list in CachingResourceResolver to ensure encoded variants of a resource are cached under separate keys.

By default this property is set to ["br", "gzip"].

Parameters:

codings - one or more supported content codings

getContentCodings

public List<String> getContentCodings()

Return a read-only list with the supported content codings.

setExtensions

public void setExtensions(Map<String,String> extensions)

Configure mappings from content codings to file extensions. A dot "." will be prepended in front of the extension value if not present.

By default this is configured with ["br" -> ".br"] and ["gzip" -> ".gz"].

Parameters:

extensions - the extensions to use.

See Also:

• registerExtension(String, String)

getExtensions

public Map<String,String> getExtensions()

Return a read-only map with coding-to-extension mappings.

registerExtension

public void registerExtension(String coding,
 String extension)

Java config friendly alternative to setExtensions(Map).

Parameters:

coding - the content coding

extension - the associated file extension

resolveResourceInternal

@Nullable
protected Resource resolveResourceInternal(@Nullable
 HttpServletRequest request,
 String requestPath,
 List<? extends Resource> locations,
 ResourceResolverChain chain)

Specified by:

resolveResourceInternal in class AbstractResourceResolver

resolveUrlPathInternal

@Nullable
protected String resolveUrlPathInternal(String resourceUrlPath,
 List<? extends Resource> locations,
 ResourceResolverChain chain)

Specified by:

resolveUrlPathInternal in class AbstractResourceResolver