HttpClient.Builder (Java SE 15 & JDK 15)
Description: declaration: module: java.net.http, package: java.net.http, class: HttpClient, interface: Builder
Keywords: java.net.http.HttpClient.Builder interface

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

# Interface HttpClient.Builder

Enclosing class:
  HttpClient

    public static interface HttpClient.Builder

A builder of HTTP Clients.

Builders are created by invoking `newBuilder`. Each of the setter methods modifies the state of the builder and returns the same instance. Builders are not thread-safe and should not be used concurrently from multiple threads without external synchronization.

Since:
  11

- ## Field Summary

  Fields
  Modifier and Type | Field | Description
  --- | --- | ---
  `static ProxySelector` | `NO_PROXY` | A proxy selector that always return `Proxy.NO_PROXY` implying a direct connection.

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `HttpClient.Builder` | `authenticator​(Authenticator authenticator)` | Sets an authenticator to use for HTTP authentication.
  `HttpClient` | `build()` | Returns a new `HttpClient` built from the current state of this builder.
  `HttpClient.Builder` | `connectTimeout​(Duration duration)` | Sets the connect timeout duration for this client.
  `HttpClient.Builder` | `cookieHandler​(CookieHandler cookieHandler)` | Sets a cookie handler.
  `HttpClient.Builder` | `executor​(Executor executor)` | Sets the executor to be used for asynchronous and dependent tasks.
  `HttpClient.Builder` | `followRedirects​(HttpClient.Redirect policy)` | Specifies whether requests will automatically follow redirects issued by the server.
  `HttpClient.Builder` | `priority​(int priority)` | Sets the default priority for any HTTP/2 requests sent from this client.
  `HttpClient.Builder` | `proxy​(ProxySelector proxySelector)` | Sets a `ProxySelector`.
  `HttpClient.Builder` | `sslContext​(SSLContext sslContext)` | Sets an `SSLContext`.
  `HttpClient.Builder` | `sslParameters​(SSLParameters sslParameters)` | Sets an `SSLParameters`.
  `HttpClient.Builder` | `version​(HttpClient.Version version)` | Requests a specific HTTP protocol version where possible.

- ## Field Details

  - ### NO_PROXY

    static final ProxySelector NO_PROXY
    A proxy selector that always return `Proxy.NO_PROXY` implying a direct connection.

    This is a convenience object that can be passed to `proxy(ProxySelector)` in order to build an instance of `HttpClient` that uses no proxy.

- ## Method Details

  - ### cookieHandler

    HttpClient.Builder cookieHandler​(CookieHandler cookieHandler)
    Sets a cookie handler.
    Parameters:
      `cookieHandler` - the cookie handler
    Returns:
      this builder

  - ### connectTimeout

    HttpClient.Builder connectTimeout​(Duration duration)
    Sets the connect timeout duration for this client.

    In the case where a new connection needs to be established, if the connection cannot be established within the given `duration`, then `HttpClient::send` throws an `HttpConnectTimeoutException`, or `HttpClient::sendAsync` completes exceptionally with an `HttpConnectTimeoutException`. If a new connection does not need to be established, for example if a connection can be reused from a previous request, then this timeout duration has no effect.

    Parameters:
      `duration` - the duration to allow the underlying connection to be established
    Returns:
      this builder
    Throws:
      `IllegalArgumentException` - if the duration is non-positive

  - ### sslContext

    HttpClient.Builder sslContext​(SSLContext sslContext)
    Sets an `SSLContext`.

    If this method is not invoked prior to building, then newly built clients will use the default context, which is normally adequate for client applications that do not need to specify protocols, or require client authentication.

    Parameters:
      `sslContext` - the SSLContext
    Returns:
      this builder

  - ### sslParameters

    HttpClient.Builder sslParameters​(SSLParameters sslParameters)
    Sets an `SSLParameters`.

    If this method is not invoked prior to building, then newly built clients will use a default, implementation specific, set of parameters.

    Some parameters which are used internally by the HTTP Client implementation (such as the application protocol list) should not be set by callers, as they may be ignored. The contents of the given object are copied.

    Parameters:
      `sslParameters` - the SSLParameters
    Returns:
      this builder

  - ### executor

    HttpClient.Builder executor​(Executor executor)
    Sets the executor to be used for asynchronous and dependent tasks.

    If this method is not invoked prior to building, a default executor is created for each newly built `HttpClient`.

    Implementation Note:
      The default executor uses a thread pool, with a custom thread factory. If a security manager has been installed, the thread factory creates threads that run with an access control context that has no permissions.
    Parameters:
      `executor` - the Executor
    Returns:
      this builder

  - ### followRedirects

    HttpClient.Builder followRedirects​(HttpClient.Redirect policy)
    Specifies whether requests will automatically follow redirects issued by the server.

    If this method is not invoked prior to building, then newly built clients will use a default redirection policy of `NEVER`.

    Parameters:
      `policy` - the redirection policy
    Returns:
      this builder

  - ### version

    HttpClient.Builder version​(HttpClient.Version version)
    Requests a specific HTTP protocol version where possible.

    If this method is not invoked prior to building, then newly built clients will prefer HTTP/2.

    If set to HTTP/2, then each request will attempt to upgrade to HTTP/2. If the upgrade succeeds, then the response to this request will use HTTP/2 and all subsequent requests and responses to the same origin server will use HTTP/2. If the upgrade fails, then the response will be handled using HTTP/1.1

    Implementation Note:
      Constraints may also affect the selection of protocol version. For example, if HTTP/2 is requested through a proxy, and if the implementation does not support this mode, then HTTP/1.1 may be used
    Parameters:
      `version` - the requested HTTP protocol version
    Returns:
      this builder

  - ### priority

    HttpClient.Builder priority​(int priority)
    Sets the default priority for any HTTP/2 requests sent from this client. The value provided must be between `1` and `256` (inclusive).
    Parameters:
      `priority` - the priority weighting
    Returns:
      this builder
    Throws:
      `IllegalArgumentException` - if the given priority is out of range

  - ### proxy

    HttpClient.Builder proxy​(ProxySelector proxySelector)
    Sets a `ProxySelector`.
    API Note:
      `ProxySelector::of` provides a `ProxySelector` which uses a single proxy for all requests. The system-wide proxy selector can be retrieved by `ProxySelector.getDefault()`.
    Implementation Note:
      If this method is not invoked prior to building, then newly built clients will use the default proxy selector, which is usually adequate for client applications. The default proxy selector supports a set of system properties related to proxy settings. This default behavior can be disabled by supplying an explicit proxy selector, such as `NO_PROXY` or one returned by `ProxySelector::of`, before building.
    Parameters:
      `proxySelector` - the ProxySelector
    Returns:
      this builder

  - ### authenticator

    HttpClient.Builder authenticator​(Authenticator authenticator)
    Sets an authenticator to use for HTTP authentication.
    Parameters:
      `authenticator` - the Authenticator
    Returns:
      this builder

  - ### build

    HttpClient build()
    Returns a new `HttpClient` built from the current state of this builder.
    Returns:
      a new `HttpClient`