Module java.net.http
Package java.net.http

# Interface HttpRequest.Builder

Enclosing class:
  `HttpRequest`

public static interface HttpRequest.Builder
A builder of HTTP requests.

Instances of `HttpRequest.Builder` are created by calling `HttpRequest.newBuilder()`, `HttpRequest.newBuilder(URI)`, or `HttpRequest.newBuilder(HttpRequest, BiPredicate)`.

The builder can be used to configure per-request state, such as: the request URI, the request method (default is GET unless explicitly set), specific request headers, etc. Each of the setter methods modifies the state of the builder and returns the same instance. The methods are not synchronized and should not be called from multiple threads without external synchronization. The `build` method returns a new `HttpRequest` each time it is invoked. Once built an `HttpRequest` is immutable, and can be sent multiple times.

Note, that not all request headers may be set by user code. Some are restricted for security reasons and others such as the headers relating to authentication, redirection and cookie management may be managed by specific APIs rather than through directly user set headers.

Since:
  11

## Method Summary

Modifier and Type
Method
Description
`HttpRequest`
`build()`
Builds and returns an `HttpRequest`.
`HttpRequest.Builder`
`copy()`
Returns an exact duplicate copy of this `Builder` based on current state.
`HttpRequest.Builder`
`DELETE()`
Sets the request method of this builder to DELETE.
`HttpRequest.Builder`
`expectContinue(boolean enable)`
Requests the server to acknowledge the request before sending the body.
`HttpRequest.Builder`
`GET()`
Sets the request method of this builder to GET.
`default HttpRequest.Builder`
`HEAD()`
Sets the request method of this builder to HEAD.
`HttpRequest.Builder`
`header(String name, String value)`
Adds the given name value pair to the set of headers for this request.
`HttpRequest.Builder`
`headers(String... headers)`
Adds the given name value pairs to the set of headers for this request.
`HttpRequest.Builder`
`method(String method, HttpRequest.BodyPublisher bodyPublisher)`
Sets the request method and request body of this builder to the given values.
`HttpRequest.Builder`
`POST(HttpRequest.BodyPublisher bodyPublisher)`
Sets the request method of this builder to POST and sets its request body publisher to the given value.
`HttpRequest.Builder`
`PUT(HttpRequest.BodyPublisher bodyPublisher)`
Sets the request method of this builder to PUT and sets its request body publisher to the given value.
`HttpRequest.Builder`
`setHeader(String name, String value)`
Sets the given name value pair to the set of headers for this request.
`HttpRequest.Builder`
`timeout(Duration duration)`
Sets a timeout for this request.
`HttpRequest.Builder`
`uri(URI uri)`
Sets this `HttpRequest`'s request `URI`.
`HttpRequest.Builder`
`version(HttpClient.Version version)`
Sets the preferred `HttpClient.Version` for this request.

## Method Details

### uri

HttpRequest.Builder uri(URI uri)
Sets this `HttpRequest`'s request `URI`.

Parameters:
  `uri` - the request URI
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if the `URI` scheme is not supported

### expectContinue

HttpRequest.Builder expectContinue(boolean enable)
Requests the server to acknowledge the request before sending the body. This is disabled by default. If enabled, the server is requested to send an error response or a `100 Continue` response before the client sends the request body. This means the request publisher for the request will not be invoked until this interim response is received.

Parameters:
  `enable` - `true` if Expect continue to be sent
Returns:
  this builder

### version

HttpRequest.Builder version(HttpClient.Version version)
Sets the preferred `HttpClient.Version` for this request.

The corresponding `HttpResponse` should be checked for the version that was actually used. If the version is not set in a request, then the version requested will be that of the sending `HttpClient`.

Parameters:
  `version` - the HTTP protocol version requested
Returns:
  this builder

### header

HttpRequest.Builder header(String name, String value)
Adds the given name value pair to the set of headers for this request. The given value is added to the list of values for that name.

Implementation Note:
  An implementation may choose to restrict some header names or values, as the HTTP Client may determine their value itself. For example, "Content-Length", which will be determined by the request Publisher. In such a case, an implementation of `HttpRequest.Builder` may choose to throw an `IllegalArgumentException` if such a header is passed to the builder.
Parameters:
  `name` - the header name
  `value` - the header value
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if the header name or value is not valid, see RFC 7230 section-3.2, or the header name or value is restricted by the implementation.

### headers

HttpRequest.Builder headers(String... headers)
Adds the given name value pairs to the set of headers for this request. The supplied `String` instances must alternate as header names and header values. To add several values to the same name then the same name must be supplied with each new value.

Parameters:
  `headers` - the list of name value pairs
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if there are an odd number of parameters, or if a header name or value is not valid, see RFC 7230 section-3.2, or a header name or value is restricted by the implementation.

### timeout

HttpRequest.Builder timeout(Duration duration)
Sets a timeout for this request. If the response is not received within the specified timeout then an `HttpTimeoutException` is thrown from `HttpClient::send` or `HttpClient::sendAsync` completes exceptionally with an `HttpTimeoutException`. The effect of not setting a timeout is the same as setting an infinite Duration, i.e. block forever.

Parameters:
  `duration` - the timeout duration
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if the duration is non-positive

### setHeader

HttpRequest.Builder setHeader(String name, String value)
Sets the given name value pair to the set of headers for this request. This overwrites any previously set values for name.

Parameters:
  `name` - the header name
  `value` - the header value
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if the header name or value is not valid, see RFC 7230 section-3.2, or the header name or value is restricted by the implementation.

### GET

HttpRequest.Builder GET()
Sets the request method of this builder to GET. This is the default.

Returns:
  this builder

### POST

HttpRequest.Builder POST(HttpRequest.BodyPublisher bodyPublisher)
Sets the request method of this builder to POST and sets its request body publisher to the given value.

Parameters:
  `bodyPublisher` - the body publisher
Returns:
  this builder

### PUT

HttpRequest.Builder PUT(HttpRequest.BodyPublisher bodyPublisher)
Sets the request method of this builder to PUT and sets its request body publisher to the given value.

Parameters:
  `bodyPublisher` - the body publisher
Returns:
  this builder

### DELETE

HttpRequest.Builder DELETE()
Sets the request method of this builder to DELETE.

Returns:
  this builder

### HEAD

default HttpRequest.Builder HEAD()
Sets the request method of this builder to HEAD.

Implementation Requirements:
  The default implementation is expected to have the same behaviour as: `return method("HEAD", BodyPublishers.noBody());`
Returns:
  this builder
Since:
  18

### method

HttpRequest.Builder method(String method, HttpRequest.BodyPublisher bodyPublisher)
Sets the request method and request body of this builder to the given values.

API Note:
  The `noBody` request body publisher can be used where no request body is required or appropriate. Whether a method is restricted, or not, is implementation specific. For example, some implementations may choose to restrict the `CONNECT` method.
Parameters:
  `method` - the method to use
  `bodyPublisher` - the body publisher
Returns:
  this builder
Throws:
  `IllegalArgumentException` - if the method name is not valid, see RFC 7230 section-3.1.1, or the method is restricted by the implementation.

### build

HttpRequest build()
Builds and returns an `HttpRequest`.

Implementation Requirements:
  This method returns a new `HttpRequest` each time it is invoked. Once built, the `HttpRequest` is immutable and can be sent multiple times.
Returns:
  a new `HttpRequest`
Throws:
  `IllegalStateException` - if a URI has not been set

### copy

HttpRequest.Builder copy()
Returns an exact duplicate copy of this `Builder` based on current state. The new builder can then be modified independently of this builder.

Returns:
  an exact copy of this builder