Module java.net.http

Package java.net.http

Class HttpRequest

java.lang.Object

java.net.http.HttpRequest

public abstract class HttpRequest
extends Object

An HTTP request.

An HttpRequest instance is built through an HttpRequest builder. An HttpRequest builder is obtained from one of the newBuilder methods. A request's URI, headers, and body can be set. Request bodies are provided through a BodyPublisher supplied to one of the POST, PUT or method methods. Once all required parameters have been set in the builder, build will return the HttpRequest. Builders can be copied and modified many times in order to build multiple related requests that differ in some parameters.

The following is an example of a GET request that prints the response body as a String:

HttpClient client = HttpClient.newHttpClient();

HttpRequest request = HttpRequest.newBuilder()
      .uri(URI.create("http://foo.com/"))
      .build();

client.sendAsync(request, BodyHandlers.ofString())
      .thenApply(HttpResponse::body)
      .thenAccept(System.out::println)
      .join();

The class BodyPublishers provides implementations of many common publishers. Alternatively, a custom BodyPublisher implementation can be used.

Since:

11

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	HttpRequest.BodyPublisher	A BodyPublisher converts high-level Java objects into a flow of byte buffers suitable for sending as a request body.
static class	HttpRequest.BodyPublishers	Implementations of BodyPublisher that implement various useful publishers, such as publishing the request body from a String, or from a file.
static interface	HttpRequest.Builder	A builder of HTTP requests.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	HttpRequest()	Creates an HttpRequest.

Method Summary

Modifier and Type	Method	Description
abstract Optional<HttpRequest.BodyPublisher>	bodyPublisher()	Returns an Optional containing the HttpRequest.BodyPublisher set on this request.
final boolean	equals(Object obj)	Tests this HTTP request instance for equality with the given object.
abstract boolean	expectContinue()	Returns this request's expect continue setting.
final int	hashCode()	Computes a hash code for this HTTP request instance.
abstract HttpHeaders	headers()	The (user-accessible) request headers that this request was (or will be) sent with.
abstract String	method()	Returns the request method for this request.
static HttpRequest.Builder	newBuilder()	Creates an HttpRequest builder.
static HttpRequest.Builder	newBuilder(HttpRequest request, BiPredicate<String,String> filter)	Creates a Builder whose initial state is copied from an existing HttpRequest.
static HttpRequest.Builder	newBuilder(URI uri)	Creates an HttpRequest builder with the given URI.
abstract Optional<Duration>	timeout()	Returns an Optional containing this request's timeout duration.
abstract URI	uri()	Returns this request's URI.
abstract Optional<HttpClient.Version>	version()	Returns an Optional containing the HTTP protocol version that will be requested for this HttpRequest.

Methods declared in class java.lang.Object

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

Constructor Details

HttpRequest

protected HttpRequest()

Creates an HttpRequest.

Method Details

newBuilder

public static HttpRequest.Builder newBuilder(URI uri)

Creates an HttpRequest builder with the given URI.

Parameters:

uri - the request URI

Returns:

a new request builder

Throws:

IllegalArgumentException - if the URI scheme is not supported.

newBuilder

public static HttpRequest.Builder newBuilder(HttpRequest request,
 BiPredicate<String,String> filter)

Creates a Builder whose initial state is copied from an existing HttpRequest.

This builder can be used to build an HttpRequest, equivalent to the original, while allowing amendment of the request state prior to construction - for example, adding additional headers.

The filter is applied to each header name value pair as they are copied from the given request. When completed, only headers that satisfy the condition as laid out by the filter will be present in the Builder returned from this method.

API Note:

The following scenarios demonstrate typical use-cases of the filter. Given an HttpRequest request:

• Retain all headers:

  HttpRequest.newBuilder(request, (n, v) -> true)

• Remove all headers:

  HttpRequest.newBuilder(request, (n, v) -> false)

• Remove a particular header (e.g. Foo-Bar):

  HttpRequest.newBuilder(request, (name, value) -> !name.equalsIgnoreCase("Foo-Bar"))

Parameters:

request - the original request

filter - a header filter

Returns:

a new request builder

Throws:

IllegalArgumentException - if a new builder cannot be seeded from the given request (for instance, if the request contains illegal parameters)

Since:

16

newBuilder

public static HttpRequest.Builder newBuilder()

Creates an HttpRequest builder.

Returns:

a new request builder

bodyPublisher

public abstract Optional<HttpRequest.BodyPublisher> bodyPublisher()

Returns an Optional containing the HttpRequest.BodyPublisher set on this request. If no BodyPublisher was set in the requests's builder, then the Optional is empty.

Returns:

an Optional containing this request's BodyPublisher

method

public abstract String method()

Returns the request method for this request. If not set explicitly, the default method for any request is "GET".

Returns:

this request's method

timeout

public abstract Optional<Duration> timeout()

Returns an Optional containing this request's timeout duration. If the timeout duration was not set in the request's builder, then the Optional is empty.

Returns:

an Optional containing this request's timeout duration

expectContinue

public abstract boolean expectContinue()

Returns this request's expect continue setting.

Returns:

this request's expect continue setting

uri

public abstract URI uri()

Returns this request's URI.

Returns:

this request's URI

version

public abstract Optional<HttpClient.Version> version()

Returns an Optional containing the HTTP protocol version that will be requested for this HttpRequest. If the version was not set in the request's builder, then the Optional is empty. In that case, the version requested will be that of the sending HttpClient. The corresponding HttpResponse should be queried to determine the version that was actually used.

Returns:

HTTP protocol version

headers

public abstract HttpHeaders headers()

The (user-accessible) request headers that this request was (or will be) sent with.

Returns:

this request's HttpHeaders

equals

public final boolean equals(Object obj)

Tests this HTTP request instance for equality with the given object.

If the given object is not an HttpRequest then this method returns false. Two HTTP requests are equal if their URI, method, and headers fields are all equal.

This method satisfies the general contract of the Object.equals method.

Overrides:

equals in class Object

Parameters:

obj - the object to which this object is to be compared

Returns:

true if, and only if, the given object is an HttpRequest that is equal to this HTTP request

See Also:

• Object.hashCode()
• HashMap

hashCode

public final int hashCode()

Computes a hash code for this HTTP request instance.

The hash code is based upon the HTTP request's URI, method, and header components, and satisfies the general contract of the Object.hashCode method.

Overrides:

hashCode in class Object

Returns:

the hash-code value for this HTTP request

See Also:

• Object.equals(java.lang.Object)
• System.identityHashCode(java.lang.Object)