org.springframework.web.cors

Class CorsConfiguration

java.lang.Object

org.springframework.web.cors.CorsConfiguration

public class CorsConfiguration
extends Object

A container for CORS configuration along with methods to check against the actual origin, HTTP methods, and headers of a given request.

By default a newly created CorsConfiguration does not permit any cross-origin requests and must be configured explicitly to indicate what should be allowed. Use applyPermitDefaultValues() to flip the initialization model to start with open defaults that permit all cross-origin requests for GET, HEAD, and POST requests.

Since:

4.2

Author:

Sebastien Deleuze, Rossen Stoyanchev, Juergen Hoeller, Sam Brannen

See Also:

CORS spec

Field Summary

Fields

Modifier and Type	Field and Description
static String	ALL Wildcard representing all origins, methods, or headers.

Constructor Summary

Constructors

Constructor and Description
CorsConfiguration() Construct a new CorsConfiguration instance with no cross-origin requests allowed for any origin by default.
CorsConfiguration(CorsConfiguration other) Construct a new CorsConfiguration instance by copying all values from the supplied CorsConfiguration.

Method Summary

Modifier and Type	Method and Description
void	addAllowedHeader(String allowedHeader) Add an actual request header to allow.
void	addAllowedMethod(HttpMethod method) Add an HTTP method to allow.
void	addAllowedMethod(String method) Add an HTTP method to allow.
void	addAllowedOrigin(String origin) Add an origin to allow.
void	addExposedHeader(String exposedHeader) Add a response header to expose.
CorsConfiguration	applyPermitDefaultValues() By default a newly created CorsConfiguration does not permit any cross-origin requests and must be configured explicitly to indicate what should be allowed.
List<String>	checkHeaders(List<String> requestHeaders) Check the supplied request headers (or the headers listed in the Access-Control-Request-Headers of a pre-flight request) against the configured allowed headers.
List<HttpMethod>	checkHttpMethod(HttpMethod requestMethod) Check the HTTP request method (or the method from the Access-Control-Request-Method header on a pre-flight request) against the configured allowed methods.
String	checkOrigin(String requestOrigin) Check the origin of the request against the configured allowed origins.
CorsConfiguration	combine(CorsConfiguration other) Combine the non-null properties of the supplied CorsConfiguration with this one.
Boolean	getAllowCredentials() Return the configured allowCredentials flag, or null if none.
List<String>	getAllowedHeaders() Return the allowed actual request headers, or null if none.
List<String>	getAllowedMethods() Return the allowed HTTP methods, or null in which case only "GET" and "HEAD" allowed.
List<String>	getAllowedOrigins() Return the configured origins to allow, or null if none.
List<String>	getExposedHeaders() Return the configured response headers to expose, or null if none.
Long	getMaxAge() Return the configured maxAge value, or null if none.
void	setAllowCredentials(Boolean allowCredentials) Whether user credentials are supported.
void	setAllowedHeaders(List<String> allowedHeaders) Set the list of headers that a pre-flight request can list as allowed for use during an actual request.
void	setAllowedMethods(List<String> allowedMethods) Set the HTTP methods to allow, e.g.
void	setAllowedOrigins(List<String> allowedOrigins) Set the origins to allow, e.g.
void	setExposedHeaders(List<String> exposedHeaders) Set the list of response headers other than simple headers (i.e.
void	setMaxAge(Long maxAge) Configure how long, in seconds, the response from a pre-flight request can be cached by clients.

Methods inherited from class java.lang.Object

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

Field Detail

ALL

public static final String ALL

Wildcard representing all origins, methods, or headers.

See Also:

Constant Field Values

Constructor Detail

CorsConfiguration

public CorsConfiguration()

Construct a new CorsConfiguration instance with no cross-origin requests allowed for any origin by default.

See Also:

applyPermitDefaultValues()

CorsConfiguration

public CorsConfiguration(CorsConfiguration other)

Construct a new CorsConfiguration instance by copying all values from the supplied CorsConfiguration.

Method Detail

setAllowedOrigins

public void setAllowedOrigins(@Nullable
                              List<String> allowedOrigins)

Set the origins to allow, e.g. "https://domain1.com".

The special value "*" allows all domains.

By default this is not set.

getAllowedOrigins

@Nullable
public List<String> getAllowedOrigins()

Return the configured origins to allow, or null if none.

See Also:

addAllowedOrigin(String), setAllowedOrigins(List)

addAllowedOrigin

public void addAllowedOrigin(String origin)

Add an origin to allow.

setAllowedMethods

public void setAllowedMethods(@Nullable
                              List<String> allowedMethods)

Set the HTTP methods to allow, e.g. "GET", "POST", "PUT", etc.

The special value "*" allows all methods.

If not set, only "GET" and "HEAD" are allowed.

By default this is not set.

Note: CORS checks use values from "Forwarded" (RFC 7239), "X-Forwarded-Host", "X-Forwarded-Port", and "X-Forwarded-Proto" headers, if present, in order to reflect the client-originated address. Consider using the ForwardedHeaderFilter in order to choose from a central place whether to extract and use, or to discard such headers. See the Spring Framework reference for more on this filter.

getAllowedMethods

@Nullable
public List<String> getAllowedMethods()

Return the allowed HTTP methods, or null in which case only "GET" and "HEAD" allowed.

See Also:

addAllowedMethod(HttpMethod), addAllowedMethod(String), setAllowedMethods(List)

addAllowedMethod

public void addAllowedMethod(HttpMethod method)

Add an HTTP method to allow.

addAllowedMethod

public void addAllowedMethod(String method)

Add an HTTP method to allow.

setAllowedHeaders

public void setAllowedHeaders(@Nullable
                              List<String> allowedHeaders)

Set the list of headers that a pre-flight request can list as allowed for use during an actual request.

The special value "*" allows actual requests to send any header.

A header name is not required to be listed if it is one of: Cache-Control, Content-Language, Expires, Last-Modified, or Pragma.

By default this is not set.

getAllowedHeaders

@Nullable
public List<String> getAllowedHeaders()

Return the allowed actual request headers, or null if none.

See Also:

addAllowedHeader(String), setAllowedHeaders(List)

addAllowedHeader

public void addAllowedHeader(String allowedHeader)

Add an actual request header to allow.

setExposedHeaders

public void setExposedHeaders(@Nullable
                              List<String> exposedHeaders)

Set the list of response headers other than simple headers (i.e. Cache-Control, Content-Language, Content-Type, Expires, Last-Modified, or Pragma) that an actual response might have and can be exposed.

The special value "*" allows all headers to be exposed for non-credentialed requests.

By default this is not set.

getExposedHeaders

@Nullable
public List<String> getExposedHeaders()

Return the configured response headers to expose, or null if none.

See Also:

addExposedHeader(String), setExposedHeaders(List)

addExposedHeader

public void addExposedHeader(String exposedHeader)

Add a response header to expose.

The special value "*" allows all headers to be exposed for non-credentialed requests.

setAllowCredentials

public void setAllowCredentials(@Nullable
                                Boolean allowCredentials)

Whether user credentials are supported.

By default this is not set (i.e. user credentials are not supported).

getAllowCredentials

@Nullable
public Boolean getAllowCredentials()

Return the configured allowCredentials flag, or null if none.

See Also:

setAllowCredentials(Boolean)

setMaxAge

public void setMaxAge(@Nullable
                      Long maxAge)

Configure how long, in seconds, the response from a pre-flight request can be cached by clients.

By default this is not set.

getMaxAge

@Nullable
public Long getMaxAge()

Return the configured maxAge value, or null if none.

See Also:

setMaxAge(Long)

applyPermitDefaultValues

public CorsConfiguration applyPermitDefaultValues()

By default a newly created CorsConfiguration does not permit any cross-origin requests and must be configured explicitly to indicate what should be allowed.

Use this method to flip the initialization model to start with open defaults that permit all cross-origin requests for GET, HEAD, and POST requests. Note however that this method will not override any existing values already set.

The following defaults are applied if not already set:

• Allow all origins.
• Allow "simple" methods GET, HEAD and POST.
• Allow all headers.
• Set max age to 1800 seconds (30 minutes).

combine

@Nullable
public CorsConfiguration combine(@Nullable
                                           CorsConfiguration other)

Combine the non-null properties of the supplied CorsConfiguration with this one.

When combining single values like allowCredentials or maxAge, this properties are overridden by non-null other properties if any.

Combining lists like allowedOrigins, allowedMethods, allowedHeaders or exposedHeaders is done in an additive way. For example, combining ["GET", "POST"] with ["PATCH"] results in ["GET", "POST", "PATCH"], but keep in mind that combining ["GET", "POST"] with ["*"] results in ["*"].

Notice that default permit values set by applyPermitDefaultValues() are overridden by any value explicitly defined.

Returns:

the combined CorsConfiguration, or this configuration if the supplied configuration is null

checkOrigin

@Nullable
public String checkOrigin(@Nullable
                                    String requestOrigin)

Check the origin of the request against the configured allowed origins.

Parameters:

requestOrigin - the origin to check

Returns:

the origin to use for the response, or null which means the request origin is not allowed

checkHttpMethod

@Nullable
public List<HttpMethod> checkHttpMethod(@Nullable
                                                  HttpMethod requestMethod)

Check the HTTP request method (or the method from the Access-Control-Request-Method header on a pre-flight request) against the configured allowed methods.

Parameters:

requestMethod - the HTTP request method to check

Returns:

the list of HTTP methods to list in the response of a pre-flight request, or null if the supplied requestMethod is not allowed

checkHeaders

@Nullable
public List<String> checkHeaders(@Nullable
                                           List<String> requestHeaders)

Check the supplied request headers (or the headers listed in the Access-Control-Request-Headers of a pre-flight request) against the configured allowed headers.

Parameters:

requestHeaders - the request headers to check

Returns:

the list of allowed headers to list in the response of a pre-flight request, or null if none of the supplied request headers is allowed