WebTestClient (Spring Framework 5.3.25 API)

```
public interface WebTestClient
```
Client for testing web servers that uses WebClient internally to perform requests while also providing a fluent API to verify responses. This client can connect to any server over HTTP, or to a WebFlux application via mock request and response objects.
Use one of the bindToXxx methods to create an instance. For example:
Warning: WebTestClient is not usable yet in Kotlin due to a type inference issue which is expected to be fixed as of Kotlin 1.3. You can watch gh-20606 for up-to-date information. Meanwhile, the proposed alternative is to use directly WebClient with its Reactor and Spring Kotlin extensions to perform integration tests on an embedded WebFlux server.
Since:

5.0

Author:

Rossen Stoyanchev, Brian Clozel, Sam Brannen, Michał Rowicki

See Also:

StatusAssertions, HeaderAssertions, JsonPathAssertions

Nested Class Summary

Nested Classes
Modifier and Type	Interface and Description
`static interface`	`WebTestClient.BodyContentSpec` Spec for expectations on the response body content.
`static interface`	`WebTestClient.BodySpec<B,S extends WebTestClient.BodySpec<B,S>>` Spec for expectations on the response body decoded to a single Object.
`static interface`	`WebTestClient.Builder` Steps for customizing the `WebClient` used to test with, internally delegating to a `WebClient.Builder`.
`static interface`	`WebTestClient.ControllerSpec` Specification for customizing controller configuration equivalent to, and internally delegating to, a `WebFluxConfigurer`.
`static interface`	`WebTestClient.ListBodySpec<E>` Spec for expectations on the response body decoded to a List.
`static interface`	`WebTestClient.MockServerSpec<B extends WebTestClient.MockServerSpec<B>>` Base specification for setting up tests without a server.
`static interface`	`WebTestClient.RequestBodySpec` Specification for providing body of a request.
`static interface`	`WebTestClient.RequestBodyUriSpec` Specification for providing the body and the URI of a request.
`static interface`	`WebTestClient.RequestHeadersSpec<S extends WebTestClient.RequestHeadersSpec<S>>` Specification for adding request headers and performing an exchange.
`static interface`	`WebTestClient.RequestHeadersUriSpec<S extends WebTestClient.RequestHeadersSpec<S>>` Specification for providing request headers and the URI of a request.
`static interface`	`WebTestClient.ResponseSpec` Chained API for applying assertions to a response.
`static interface`	`WebTestClient.RouterFunctionSpec` Specification for customizing router function configuration.
`static interface`	`WebTestClient.UriSpec<S extends WebTestClient.RequestHeadersSpec<?>>` Specification for providing the URI of a request.

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`WEBTESTCLIENT_REQUEST_ID` The name of a request header used to assign a unique id to every request performed through the `WebTestClient`.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`static WebTestClient.MockServerSpec<?>`	`bindToApplicationContext(ApplicationContext applicationContext)` Use this option to set up a server from the Spring configuration of your application, or some subset of it.
`static WebTestClient.ControllerSpec`	`bindToController(Object... controllers)` Use this server setup to test one `@Controller` at a time.
`static WebTestClient.RouterFunctionSpec`	`bindToRouterFunction(RouterFunction<?> routerFunction)` Use this option to set up a server from a `RouterFunction`.
`static WebTestClient.Builder`	`bindToServer()` This server setup option allows you to connect to a live server through a Reactor Netty client connector.
`static WebTestClient.Builder`	`bindToServer(ClientHttpConnector connector)` A variant of `bindToServer()` with a pre-configured connector.
`static WebTestClient.MockServerSpec<?>`	`bindToWebHandler(WebHandler webHandler)` Integration testing with a "mock" server targeting the given WebHandler.
`WebTestClient.RequestHeadersUriSpec<?>`	`delete()` Prepare an HTTP DELETE request.
`WebTestClient.RequestHeadersUriSpec<?>`	`get()` Prepare an HTTP GET request.
`WebTestClient.RequestHeadersUriSpec<?>`	`head()` Prepare an HTTP HEAD request.
`WebTestClient.RequestBodyUriSpec`	`method(HttpMethod method)` Prepare a request for the specified `HttpMethod`.
`WebTestClient.Builder`	`mutate()` Return a builder to mutate properties of this web test client.
`WebTestClient`	`mutateWith(WebTestClientConfigurer configurer)` Mutate the `WebTestClient`, apply the given configurer, and build a new instance.
`WebTestClient.RequestHeadersUriSpec<?>`	`options()` Prepare an HTTP OPTIONS request.
`WebTestClient.RequestBodyUriSpec`	`patch()` Prepare an HTTP PATCH request.
`WebTestClient.RequestBodyUriSpec`	`post()` Prepare an HTTP POST request.
`WebTestClient.RequestBodyUriSpec`	`put()` Prepare an HTTP PUT request.

- Field Detail
  - WEBTESTCLIENT_REQUEST_ID
```
static final String WEBTESTCLIENT_REQUEST_ID
```
    The name of a request header used to assign a unique id to every request performed through the WebTestClient. This can be useful for storing contextual information at all phases of request processing (e.g. from a server-side component) under that id and later to look up that information once an ExchangeResult is available.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - get
```
WebTestClient.RequestHeadersUriSpec<?> get()
```
    Prepare an HTTP GET request.
    
    Returns:
    
    a spec for specifying the target URL
  - head
```
WebTestClient.RequestHeadersUriSpec<?> head()
```
    Prepare an HTTP HEAD request.
    
    Returns:
    
    a spec for specifying the target URL
  - post
```
WebTestClient.RequestBodyUriSpec post()
```
    Prepare an HTTP POST request.
    
    Returns:
    
    a spec for specifying the target URL
  - put
```
WebTestClient.RequestBodyUriSpec put()
```
    Prepare an HTTP PUT request.
    
    Returns:
    
    a spec for specifying the target URL
  - patch
```
WebTestClient.RequestBodyUriSpec patch()
```
    Prepare an HTTP PATCH request.
    
    Returns:
    
    a spec for specifying the target URL
  - delete
```
WebTestClient.RequestHeadersUriSpec<?> delete()
```
    Prepare an HTTP DELETE request.
    
    Returns:
    
    a spec for specifying the target URL
  - options
```
WebTestClient.RequestHeadersUriSpec<?> options()
```
    Prepare an HTTP OPTIONS request.
    
    Returns:
    
    a spec for specifying the target URL
  - method
```
WebTestClient.RequestBodyUriSpec method(HttpMethod method)
```
    Prepare a request for the specified HttpMethod.
    
    Returns:
    
    a spec for specifying the target URL
  - mutate
```
WebTestClient.Builder mutate()
```
    Return a builder to mutate properties of this web test client.
  - mutateWith
```
WebTestClient mutateWith(WebTestClientConfigurer configurer)
```
    Mutate the WebTestClient, apply the given configurer, and build a new instance. Essentially a shortcut for:
```
 mutate().apply(configurer).build();
 
```
    Parameters:
    
    configurer - the configurer to apply
    
    Returns:
    
    the mutated test client
  - bindToController
```
static WebTestClient.ControllerSpec bindToController(Object... controllers)
```
    Use this server setup to test one @Controller at a time. This option loads the default configuration of @EnableWebFlux. There are builder methods to customize the Java config. The resulting WebFlux application will be tested without an HTTP server using a mock request and response.
    
    Parameters:
    
    controllers - one or more controller instances to test (specified Class will be turned into instance)
    
    Returns:
    
    chained API to customize server and client config; use WebTestClient.MockServerSpec.configureClient() to transition to client config
  - bindToRouterFunction
```
static WebTestClient.RouterFunctionSpec bindToRouterFunction(RouterFunction<?> routerFunction)
```
    Use this option to set up a server from a RouterFunction. Internally the provided configuration is passed to RouterFunctions#toWebHandler. The resulting WebFlux application will be tested without an HTTP server using a mock request and response.
    
    Parameters:
    
    routerFunction - the RouterFunction to test
    
    Returns:
    
    chained API to customize server and client config; use WebTestClient.MockServerSpec.configureClient() to transition to client config
  - bindToApplicationContext
```
static WebTestClient.MockServerSpec<?> bindToApplicationContext(ApplicationContext applicationContext)
```
    Use this option to set up a server from the Spring configuration of your application, or some subset of it. Internally the provided configuration is passed to WebHttpHandlerBuilder to set up the request processing chain. The resulting WebFlux application will be tested without an HTTP server using a mock request and response.
    Consider using the TestContext framework and @ContextConfiguration in order to efficiently load and inject the Spring configuration into the test class.
    
    Parameters:
    
    applicationContext - the Spring context
    
    Returns:
    
    chained API to customize server and client config; use WebTestClient.MockServerSpec.configureClient() to transition to client config
  - bindToWebHandler
```
static WebTestClient.MockServerSpec<?> bindToWebHandler(WebHandler webHandler)
```
    Integration testing with a "mock" server targeting the given WebHandler.
    
    Parameters:
    
    webHandler - the handler to test
    
    Returns:
    
    chained API to customize server and client config; use WebTestClient.MockServerSpec.configureClient() to transition to client config
  - bindToServer
```
static WebTestClient.Builder bindToServer()
```
    This server setup option allows you to connect to a live server through a Reactor Netty client connector.
```
 WebTestClient client = WebTestClient.bindToServer()
         .baseUrl("http://localhost:8080")
         .build();
 
```
    Returns:
    
    chained API to customize client config
  - bindToServer
```
static WebTestClient.Builder bindToServer(ClientHttpConnector connector)
```
    A variant of bindToServer() with a pre-configured connector.
    
    Returns:
    
    chained API to customize client config
    
    Since:
    
    5.0.2

Interface WebTestClient

Nested Class Summary

Field Summary

Method Summary

Field Detail

WEBTESTCLIENT_REQUEST_ID

Method Detail

get

head

post

put

patch

delete

options

method

mutate

mutateWith

bindToController

bindToRouterFunction

bindToApplicationContext

bindToWebHandler

bindToServer

bindToServer