org.springframework.web.server

Interface ServerWebExchange

All Known Implementing Classes:

DefaultServerRequestBuilder.DelegatingServerWebExchange, DefaultServerWebExchange, DefaultServerWebExchangeBuilder.MutativeDecorator, MockServerWebExchange, ServerWebExchangeDecorator

public interface ServerWebExchange

Contract for an HTTP request-response interaction. Provides access to the HTTP request and response and also exposes additional server-side processing related properties and features such as request attributes.

Since:

5.0

Author:

Rossen Stoyanchev

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	ServerWebExchange.Builder Builder for mutating an existing ServerWebExchange.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	LOG_ID_ATTRIBUTE Name of attribute whose value can be used to correlate log messages for this exchange.

Method Summary

Modifier and Type	Method and Description
void	addUrlTransformer(java.util.function.Function<java.lang.String,java.lang.String> transformer) Register an additional URL transformation function for use with transformUrl(java.lang.String).
boolean	checkNotModified(java.time.Instant lastModified) An overloaded variant of checkNotModified(String, Instant) with a last-modified timestamp only.
boolean	checkNotModified(java.lang.String etag) An overloaded variant of checkNotModified(String, Instant) with an ETag (entity tag) value only.
boolean	checkNotModified(java.lang.String etag, java.time.Instant lastModified) Check whether the requested resource has been modified given the supplied ETag (entity tag) and last-modified timestamp as determined by the application.
ApplicationContext	getApplicationContext() Return the ApplicationContext associated with the web application, if it was initialized with one via WebHttpHandlerBuilder.applicationContext(ApplicationContext).
default <T> T	getAttribute(java.lang.String name) Return the request attribute value if present.
default <T> T	getAttributeOrDefault(java.lang.String name, T defaultValue) Return the request attribute value, or a default, fallback value.
java.util.Map<java.lang.String,java.lang.Object>	getAttributes() Return a mutable map of request attributes for the current exchange.
<any>	getFormData() Return the form data from the body of the request if the Content-Type is "application/x-www-form-urlencoded" or an empty map otherwise.
LocaleContext	getLocaleContext() Return the LocaleContext using the configured LocaleContextResolver.
java.lang.String	getLogPrefix() Return a log message prefix to use to correlate messages for this exchange.
<any>	getMultipartData() Return the parts of a multipart request if the Content-Type is "multipart/form-data" or an empty map otherwise.
<T extends java.security.Principal> <any>	getPrincipal() Return the authenticated user for the request, if any.
ServerHttpRequest	getRequest() Return the current HTTP request.
default <T> T	getRequiredAttribute(java.lang.String name) Return the request attribute value or if not present raise an IllegalArgumentException.
ServerHttpResponse	getResponse() Return the current HTTP response.
<any>	getSession() Return the web session for the current request.
boolean	isNotModified() Returns true if the one of the checkNotModified methods in this contract were used and they returned true.
default ServerWebExchange.Builder	mutate() Return a builder to mutate properties of this exchange by wrapping it with ServerWebExchangeDecorator and returning either mutated values or delegating back to this instance.
java.lang.String	transformUrl(java.lang.String url) Transform the given url according to the registered transformation function(s).

Field Detail

LOG_ID_ATTRIBUTE

static final java.lang.String LOG_ID_ATTRIBUTE

Name of attribute whose value can be used to correlate log messages for this exchange. Use getLogPrefix() to obtain a consistently formatted prefix based on this attribute.

Since:

5.1

See Also:

getLogPrefix()

Method Detail

getRequest

ServerHttpRequest getRequest()

Return the current HTTP request.

getResponse

ServerHttpResponse getResponse()

Return the current HTTP response.

getAttributes

java.util.Map<java.lang.String,java.lang.Object> getAttributes()

Return a mutable map of request attributes for the current exchange.

getAttribute

@Nullable
default <T> T getAttribute(java.lang.String name)

Return the request attribute value if present.

Type Parameters:

T - the attribute type

Parameters:

name - the attribute name

Returns:

the attribute value

getRequiredAttribute

default <T> T getRequiredAttribute(java.lang.String name)

Return the request attribute value or if not present raise an IllegalArgumentException.

Type Parameters:

T - the attribute type

Parameters:

name - the attribute name

Returns:

the attribute value

getAttributeOrDefault

default <T> T getAttributeOrDefault(java.lang.String name,
                                    T defaultValue)

Return the request attribute value, or a default, fallback value.

Type Parameters:

T - the attribute type

Parameters:

name - the attribute name

defaultValue - a default value to return instead

Returns:

the attribute value

getSession

<any> getSession()

Return the web session for the current request. Always guaranteed to return an instance either matching to the session id requested by the client, or with a new session id either because the client did not specify one or because the underlying session had expired. Use of this method does not automatically create a session. See WebSession for more details.

getPrincipal

<T extends java.security.Principal> <any> getPrincipal()

Return the authenticated user for the request, if any.

getFormData

<any> getFormData()

Return the form data from the body of the request if the Content-Type is "application/x-www-form-urlencoded" or an empty map otherwise.

Note: calling this method causes the request body to be read and parsed in full and the resulting MultiValueMap is cached so that this method is safe to call more than once.

getMultipartData

<any> getMultipartData()

Return the parts of a multipart request if the Content-Type is "multipart/form-data" or an empty map otherwise.

Note: calling this method causes the request body to be read and parsed in full and the resulting MultiValueMap is cached so that this method is safe to call more than once.

getLocaleContext

LocaleContext getLocaleContext()

Return the LocaleContext using the configured LocaleContextResolver.

getApplicationContext

@Nullable
ApplicationContext getApplicationContext()

Return the ApplicationContext associated with the web application, if it was initialized with one via WebHttpHandlerBuilder.applicationContext(ApplicationContext).

Since:

5.0.3

See Also:

WebHttpHandlerBuilder.applicationContext(ApplicationContext)

isNotModified

boolean isNotModified()

Returns true if the one of the checkNotModified methods in this contract were used and they returned true.

checkNotModified

boolean checkNotModified(java.time.Instant lastModified)

An overloaded variant of checkNotModified(String, Instant) with a last-modified timestamp only.

Parameters:

lastModified - the last-modified time

Returns:

whether the request qualifies as not modified

checkNotModified

boolean checkNotModified(java.lang.String etag)

An overloaded variant of checkNotModified(String, Instant) with an ETag (entity tag) value only.

Parameters:

etag - the entity tag for the underlying resource.

Returns:

true if the request does not require further processing.

checkNotModified

boolean checkNotModified(@Nullable
                         java.lang.String etag,
                         java.time.Instant lastModified)

Check whether the requested resource has been modified given the supplied ETag (entity tag) and last-modified timestamp as determined by the application. Also transparently prepares the response, setting HTTP status, and adding "ETag" and "Last-Modified" headers when applicable. This method works with conditional GET/HEAD requests as well as with conditional POST/PUT/DELETE requests.

Note: The HTTP specification recommends setting both ETag and Last-Modified values, but you can also use #checkNotModified(String) or checkNotModified(Instant).

Parameters:

etag - the entity tag that the application determined for the underlying resource. This parameter will be padded with quotes (") if necessary.

lastModified - the last-modified timestamp that the application determined for the underlying resource

Returns:

true if the request does not require further processing.

transformUrl

java.lang.String transformUrl(java.lang.String url)

Transform the given url according to the registered transformation function(s). By default, this method returns the given url, though additional transformation functions can by registered with addUrlTransformer(java.util.function.Function<java.lang.String, java.lang.String>)

Parameters:

url - the URL to transform

Returns:

the transformed URL

addUrlTransformer

void addUrlTransformer(java.util.function.Function<java.lang.String,java.lang.String> transformer)

Register an additional URL transformation function for use with transformUrl(java.lang.String). The given function can be used to insert an id for authentication, a nonce for CSRF protection, etc.

Note that the given function is applied after any previously registered functions.

Parameters:

transformer - a URL transformation function to add

getLogPrefix

java.lang.String getLogPrefix()

Return a log message prefix to use to correlate messages for this exchange. The prefix is based on the value of the attribute LOG_ID_ATTRIBUTE along with some extra formatting so that the prefix can be conveniently prepended with no further formatting no separators required.

Returns:

the log message prefix or an empty String if the LOG_ID_ATTRIBUTE is not set.

Since:

5.1

mutate

default ServerWebExchange.Builder mutate()

Return a builder to mutate properties of this exchange by wrapping it with ServerWebExchangeDecorator and returning either mutated values or delegating back to this instance.