Module io.helidon.webclient.api
Package io.helidon.webclient.api

Class HttpClientConfig.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>

java.lang.Object
io.helidon.webclient.api.HttpConfigBase.BuilderBase<BUILDER,PROTOTYPE>
io.helidon.webclient.api.HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>
Type Parameters:
BUILDER - type of the builder extending this abstract builder
PROTOTYPE - type of the prototype interface that would be built by Prototype.Builder.buildPrototype()
All Implemented Interfaces:
Prototype.Builder<BUILDER,PROTOTYPE>, ConfigBuilderSupport.ConfiguredBuilder<BUILDER,PROTOTYPE>, ConfigBuilderSupport.ConfiguredBuilder<BUILDER,PROTOTYPE>
Direct Known Subclasses:
GrpcClientConfig.BuilderBase, Http1ClientConfig.BuilderBase, Http2ClientConfig.BuilderBase, HttpClientConfig.Builder, JsonRpcClientConfig.BuilderBase, WebClientConfig.BuilderBase, WsClientConfig.BuilderBase
Enclosing interface:
HttpClientConfig
public abstract static class HttpClientConfig.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig> extends HttpConfigBase.BuilderBase<BUILDER,PROTOTYPE> implements ConfigBuilderSupport.ConfiguredBuilder<BUILDER,PROTOTYPE>
Fluent API builder base for HttpClientConfig.

  • Constructor Details

    • BuilderBase

      protected BuilderBase()
      Protected to support extensibility.

  • Method Details

    • from

      public BUILDER from(HttpClientConfig prototype)
      Update this builder from an existing prototype instance. This method disables automatic service discovery.
      Parameters:
      prototype - existing prototype to update this builder from
      Returns:
      updated builder instance

    • from

      public BUILDER from(HttpClientConfig.BuilderBase<?,?> builder)
      Update this builder from an existing prototype builder instance.
      Parameters:
      builder - existing builder prototype to update this builder from
      Returns:
      updated builder instance

    • baseUri

      public BUILDER baseUri(URI baseUri)
      Base URI of the client.
      Parameters:
      baseUri - base URI to use, query is extracted to base query (if any)
      Returns:
      updated builder instance

    • baseUri

      public BUILDER baseUri(String baseUri)
      Base URI of the client.
      Parameters:
      baseUri - base URI to use, query is extracted to base query (if any)
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(HeaderName name, String value)
      Add a default header value.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(HeaderName name, int value)
      Add a default header value.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(HeaderName name, long value)
      Add a default header value.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(String name, String value)
      Add default header value. This method is not optimal and should only be used when the header name is really obtained from a string, in other cases, use an alternative with HeaderName or Header.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(String name, int value)
      Add default header value. This method is not optimal and should only be used when the header name is really obtained from a string, in other cases, use an alternative with HeaderName or Header.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • addHeader

      public BUILDER addHeader(String name, long value)
      Add default header value. This method is not optimal and should only be used when the header name is really obtained from a string, in other cases, use an alternative with HeaderName or Header.
      Parameters:
      name - name of the header
      value - value of the header
      Returns:
      updated builder instance

    • config

      @Deprecated public BUILDER config(Config config)
      Deprecated.
      use config(io.helidon.config.Config)
      Update builder from configuration (node of this type). If a value is present in configuration, it would override currently configured values.
      Specified by:
      config in interface ConfigBuilderSupport.ConfiguredBuilder<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>
      Overrides:
      config in class HttpConfigBase.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>
      Parameters:
      config - configuration instance used to obtain values to update this builder
      Returns:
      updated builder instance

    • config

      public BUILDER config(Config config)
      Update builder from configuration (node of this type). If a value is present in configuration, it would override currently configured values.
      Specified by:
      config in interface ConfigBuilderSupport.ConfiguredBuilder<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>
      Overrides:
      config in class HttpConfigBase.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>
      Parameters:
      config - configuration instance used to obtain values to update this builder
      Returns:
      updated builder instance

    • clearBaseUri

      public BUILDER clearBaseUri()
      Clear existing value of baseUri.
      Returns:
      updated builder instance
      See Also:

    • baseUri

      public BUILDER baseUri(ClientUri baseUri)
      Base uri used by the client in all requests.
      Parameters:
      baseUri - base uri of the client requests
      Returns:
      updated builder instance
      See Also:

    • clearBaseAddress

      public BUILDER clearBaseAddress()
      Clear existing value of baseAddress.
      Returns:
      updated builder instance
      See Also:

    • baseAddress

      public BUILDER baseAddress(SocketAddress baseAddress)
      Base address used by the client in all requests. This may be either an Inet address or a UNIX domain socket address.
      Parameters:
      baseAddress - base address of the client requests
      Returns:
      updated builder instance
      See Also:

    • clearBaseQuery

      public BUILDER clearBaseQuery()
      Clear existing value of baseQuery.
      Returns:
      updated builder instance
      See Also:

    • baseQuery

      public BUILDER baseQuery(UriQuery baseQuery)
      Base query used by the client in all requests.
      Parameters:
      baseQuery - base query of the client requests
      Returns:
      updated builder instance
      See Also:

    • clearBaseFragment

      public BUILDER clearBaseFragment()
      Clear existing value of baseFragment.
      Returns:
      updated builder instance
      See Also:

    • baseFragment

      public BUILDER baseFragment(UriFragment baseFragment)
      Base fragment used by the client in all requests (unless overwritten on per-request basis).
      Parameters:
      baseFragment - fragment to use
      Returns:
      updated builder instance
      See Also:

    • socketOptions

      public BUILDER socketOptions(SocketOptions socketOptions)
      Socket options for connections opened by this client. If there is a value explicitly configured on this type and on the socket options, the one configured on this type's builder will win:
      Parameters:
      socketOptions - socket options
      Returns:
      updated builder instance
      See Also:

    • socketOptions

      public BUILDER socketOptions(Consumer<SocketOptions.Builder> consumer)
      Socket options for connections opened by this client. If there is a value explicitly configured on this type and on the socket options, the one configured on this type's builder will win:
      Parameters:
      consumer - consumer of builder of socket options
      Returns:
      updated builder instance
      See Also:

    • socketOptions

      public BUILDER socketOptions(Supplier<? extends SocketOptions> supplier)
      Socket options for connections opened by this client. If there is a value explicitly configured on this type and on the socket options, the one configured on this type's builder will win:
      Parameters:
      supplier - supplier of socket options
      Returns:
      updated builder instance
      See Also:

    • dnsResolver

      public BUILDER dnsResolver(DnsResolver dnsResolver)
      DNS resolver to be used by this client.
      Parameters:
      dnsResolver - dns resolver
      Returns:
      updated builder instance
      See Also:

    • dnsAddressLookup

      public BUILDER dnsAddressLookup(DnsAddressLookup dnsAddressLookup)
      DNS address lookup preferences to be used by this client. Default value is determined by capabilities of the system.
      Parameters:
      dnsAddressLookup - dns address lookup strategy
      Returns:
      updated builder instance
      See Also:

    • defaultHeadersMap

      public BUILDER defaultHeadersMap(Map<String,String> defaultHeadersMap)
      Default headers to be used in every request from configuration. This method replaces all values with the new ones.
      Parameters:
      defaultHeadersMap - default headers
      Returns:
      updated builder instance
      See Also:

    • addDefaultHeadersMap

      public BUILDER addDefaultHeadersMap(Map<String,String> defaultHeadersMap)
      Default headers to be used in every request from configuration. This method keeps existing values, then puts all new values into the map.
      Parameters:
      defaultHeadersMap - default headers
      Returns:
      updated builder instance
      See Also:

    • clearHeaders

      public BUILDER clearHeaders()
      Clear all headers.
      Returns:
      updated builder instance
      See Also:

    • headers

      public BUILDER headers(Set<? extends Header> headers)
      Default headers to be used in every request.
      Parameters:
      headers - default headers
      Returns:
      updated builder instance
      See Also:

    • addHeaders

      public BUILDER addHeaders(Set<? extends Header> headers)
      Default headers to be used in every request.
      Parameters:
      headers - default headers
      Returns:
      updated builder instance
      See Also:

    • addHeader

      public BUILDER addHeader(Header header)
      Default headers to be used in every request.
      Parameters:
      header - add single default headers
      Returns:
      updated builder instance
      See Also:

    • mediaTypeParserMode

      public BUILDER mediaTypeParserMode(ParserMode mediaTypeParserMode)
      Configure media type parsing mode for HTTP Content-Type header.
      Parameters:
      mediaTypeParserMode - media type parsing mode
      Returns:
      updated builder instance
      See Also:

    • contentEncoding

      public BUILDER contentEncoding(ContentEncodingContext contentEncoding)
      Configure the listener specific ContentEncodingContext. This method discards all previously registered ContentEncodingContext. If no content encoding context is registered, default encoding context is used.
      Parameters:
      contentEncoding - content encoding context
      Returns:
      updated builder instance
      See Also:

    • contentEncoding

      public BUILDER contentEncoding(ContentEncodingContextConfig contentEncoding)
      Configure the listener specific ContentEncodingContext. This method discards all previously registered ContentEncodingContext. If no content encoding context is registered, default encoding context is used.
      Parameters:
      contentEncoding - prototype of content encoding context
      Returns:
      updated builder instance
      See Also:

    • contentEncoding

      public BUILDER contentEncoding(Consumer<ContentEncodingContextConfig.Builder> consumer)
      Configure the listener specific ContentEncodingContext. This method discards all previously registered ContentEncodingContext. If no content encoding context is registered, default encoding context is used.
      Parameters:
      consumer - consumer of builder of content encoding context
      Returns:
      updated builder instance
      See Also:

    • contentEncoding

      public BUILDER contentEncoding(Supplier<? extends ContentEncodingContext> supplier)
      Configure the listener specific ContentEncodingContext. This method discards all previously registered ContentEncodingContext. If no content encoding context is registered, default encoding context is used.
      Parameters:
      supplier - supplier of content encoding context
      Returns:
      updated builder instance
      See Also:

    • mediaContext

      public BUILDER mediaContext(MediaContext mediaContext)
      Configure the listener specific MediaContext. This method discards all previously registered MediaContext. If no media context is registered, default media context is used.
      Parameters:
      mediaContext - media context
      Returns:
      updated builder instance
      See Also:

    • mediaContext

      public BUILDER mediaContext(MediaContextConfig mediaContext)
      Configure the listener specific MediaContext. This method discards all previously registered MediaContext. If no media context is registered, default media context is used.
      Parameters:
      mediaContext - prototype of media context
      Returns:
      updated builder instance
      See Also:

    • mediaContext

      public BUILDER mediaContext(Consumer<MediaContextConfig.Builder> consumer)
      Configure the listener specific MediaContext. This method discards all previously registered MediaContext. If no media context is registered, default media context is used.
      Parameters:
      consumer - consumer of builder of media context
      Returns:
      updated builder instance
      See Also:

    • mediaContext

      public BUILDER mediaContext(Supplier<? extends MediaContext> supplier)
      Configure the listener specific MediaContext. This method discards all previously registered MediaContext. If no media context is registered, default media context is used.
      Parameters:
      supplier - supplier of media context
      Returns:
      updated builder instance
      See Also:

    • clearMediaSupports

      public BUILDER clearMediaSupports()
      Clear all mediaSupports.
      Returns:
      updated builder instance
      See Also:

    • mediaSupports

      public BUILDER mediaSupports(List<? extends MediaSupport> mediaSupports)
      Media supports (manually added). If both mediaContext() and this is configured, there will be a new context created from return of this method, with fallback of mediaContext().
      Parameters:
      mediaSupports - list of explicitly added media supports
      Returns:
      updated builder instance
      See Also:

    • addMediaSupports

      public BUILDER addMediaSupports(List<? extends MediaSupport> mediaSupports)
      Media supports (manually added). If both mediaContext() and this is configured, there will be a new context created from return of this method, with fallback of mediaContext().
      Parameters:
      mediaSupports - list of explicitly added media supports
      Returns:
      updated builder instance
      See Also:

    • addMediaSupport

      public BUILDER addMediaSupport(MediaSupport mediaSupport)
      Media supports (manually added). If both mediaContext() and this is configured, there will be a new context created from return of this method, with fallback of mediaContext().
      Parameters:
      mediaSupport - add single list of explicitly added media supports
      Returns:
      updated builder instance
      See Also:

    • clearServices

      public BUILDER clearServices()
      Clear all services.
      Returns:
      updated builder instance
      See Also:

    • services

      public BUILDER services(List<? extends WebClientService> services)
      WebClient services.
      Parameters:
      services - services to use with this web client
      Returns:
      updated builder instance
      See Also:

    • addServices

      public BUILDER addServices(List<? extends WebClientService> services)
      WebClient services.
      Parameters:
      services - services to use with this web client
      Returns:
      updated builder instance
      See Also:

    • addService

      public BUILDER addService(WebClientService service)
      WebClient services.
      Parameters:
      service - add single services to use with this web client
      Returns:
      updated builder instance
      See Also:

    • relativeUris

      public BUILDER relativeUris(boolean relativeUris)
      Can be set to true to force the use of relative URIs in all requests, regardless of the presence or absence of proxies or no-proxy lists.
      Parameters:
      relativeUris - relative URIs flag
      Returns:
      updated builder instance
      See Also:

    • executor

      public BUILDER executor(ExecutorService executor)
      Client executor service.
      Parameters:
      executor - executor service to use when needed (such as for HTTP/2)
      Returns:
      updated builder instance
      See Also:

    • sendExpectContinue

      public BUILDER sendExpectContinue(boolean sendExpectContinue)
      Whether Expect-100-Continue header is sent to verify server availability before sending an entity.

      Defaults to true.

      Parameters:
      sendExpectContinue - whether Expect:100-Continue header should be sent on streamed transfers
      Returns:
      updated builder instance
      See Also:

    • connectionCacheSize

      public BUILDER connectionCacheSize(int connectionCacheSize)
      Maximal size of the connection cache for a single connection key. A connection key is formed by the scheme, host, port, TLS configuration, DNS resolver, DNS address lookup, and proxy.

      For most HTTP protocols, we may cache connections to various endpoints for keep alive (or stream reuse in case of HTTP/2). This option limits the size. Setting this number lower than the "usual" number of target services will cause connections to be closed and reopened frequently.

      Parameters:
      connectionCacheSize -
      Returns:
      updated builder instance
      See Also:

    • clearCookieManager

      public BUILDER clearCookieManager()
      Clear existing value of cookieManager.
      Returns:
      updated builder instance
      See Also:

    • cookieManager

      public BUILDER cookieManager(WebClientCookieManager cookieManager)
      WebClient cookie manager.
      Parameters:
      cookieManager - cookie manager to use
      Returns:
      updated builder instance
      See Also:

    • cookieManager

      public BUILDER cookieManager(WebClientCookieManagerConfig cookieManager)
      WebClient cookie manager.
      Parameters:
      cookieManager - prototype of cookie manager to use
      Returns:
      updated builder instance
      See Also:

    • cookieManager

      public BUILDER cookieManager(Consumer<WebClientCookieManagerConfig.Builder> consumer)
      WebClient cookie manager.
      Parameters:
      consumer - consumer of builder of cookie manager to use
      Returns:
      updated builder instance
      See Also:

    • readContinueTimeout

      public BUILDER readContinueTimeout(Duration readContinueTimeout)
      Socket 100-Continue read timeout. Default is 1 second. This read timeout is used when 100-Continue is sent by the client, before it sends an entity.
      Parameters:
      readContinueTimeout - read 100-Continue timeout duration
      Returns:
      updated builder instance
      See Also:

    • shareConnectionCache

      public BUILDER shareConnectionCache(boolean shareConnectionCache)
      Whether to share connection cache between all the WebClient instances in JVM.
      Parameters:
      shareConnectionCache - true if connection cache is shared
      Returns:
      updated builder instance
      See Also:

    • maxInMemoryEntity

      public BUILDER maxInMemoryEntity(int maxInMemoryEntity)
      If the entity is expected to be smaller that this number of bytes, it would be buffered in memory to optimize performance. If bigger, streaming will be used.

      Note that for some entity types we cannot use streaming, as they are already fully in memory (String, byte[]), for such cases, this option is ignored. Default is 128Kb.

      Parameters:
      maxInMemoryEntity - maximal number of bytes to buffer in memory for supported writers
      Returns:
      updated builder instance
      See Also:

    • writeBufferSize

      public BUILDER writeBufferSize(int writeBufferSize)
      Buffer size used when writing data to the underlying socket on a client TCP connection. A value that is less or equal to 1 can be set to disable buffering at this level. Note that if writing data to the socket in small chunks, they may not be delivered to the network immediately due to Nagle's algorithm (i.e., if TCP_NO_DELAY is turned off).
      Parameters:
      writeBufferSize - number of bytes in write buffer
      Returns:
      updated builder instance
      See Also:

    • connectionListener

      public BUILDER connectionListener(ConnectionListener connectionListener)
      Socket lifecycle callbacks. The default implementation does nothing, and Initializer logic that is called immediately after the client connection is established, before any TLS or HTTP data is written. The default initializer does nothing.
      Parameters:
      connectionListener - The socket listener.
      Returns:
      updated builder instance
      See Also:

    • servicesDiscoverServices

      public BUILDER servicesDiscoverServices(boolean servicesDiscoverServices)
      Service discovery flag for services(). If set to true, services will be discovered from Java service loader, or Helidon ServiceRegistry.
      Parameters:
      servicesDiscoverServices - whether to enable automatic service discovery
      Returns:
      updated builder instance
      See Also:

    • baseUri

      public Optional<ClientUri> baseUri()
      Base uri used by the client in all requests.
      Returns:
      base uri of the client requests

    • baseAddress

      public Optional<SocketAddress> baseAddress()
      Base address used by the client in all requests. This may be either an Inet address or a UNIX domain socket address.
      Returns:
      base address of the client requests

    • baseQuery

      public Optional<UriQuery> baseQuery()
      Base query used by the client in all requests.
      Returns:
      base query of the client requests

    • baseFragment

      public Optional<UriFragment> baseFragment()
      Base fragment used by the client in all requests (unless overwritten on per-request basis).
      Returns:
      fragment to use

    • socketOptions

      public Optional<SocketOptions> socketOptions()
      Socket options for connections opened by this client. If there is a value explicitly configured on this type and on the socket options, the one configured on this type's builder will win:
      Returns:
      socket options

    • dnsResolver

      public Optional<DnsResolver> dnsResolver()
      DNS resolver to be used by this client.
      Returns:
      dns resolver

    • dnsAddressLookup

      public Optional<DnsAddressLookup> dnsAddressLookup()
      DNS address lookup preferences to be used by this client. Default value is determined by capabilities of the system.
      Returns:
      dns address lookup strategy

    • defaultHeadersMap

      public Map<String,String> defaultHeadersMap()
      Default headers to be used in every request from configuration.
      Returns:
      default headers

    • headers

      public Set<Header> headers()
      Default headers to be used in every request.
      Returns:
      default headers

    • mediaTypeParserMode

      public ParserMode mediaTypeParserMode()
      Configure media type parsing mode for HTTP Content-Type header.
      Returns:
      media type parsing mode

    • contentEncoding

      public Optional<ContentEncodingContext> contentEncoding()
      Configure the listener specific ContentEncodingContext. This method discards all previously registered ContentEncodingContext. If no content encoding context is registered, default encoding context is used.
      Returns:
      content encoding context

    • mediaContext

      public MediaContext mediaContext()
      Configure the listener specific MediaContext. This method discards all previously registered MediaContext. If no media context is registered, default media context is used.
      Returns:
      media context

    • mediaSupports

      public List<MediaSupport> mediaSupports()
      Media supports (manually added). If both mediaContext() and this is configured, there will be a new context created from return of this method, with fallback of mediaContext().
      Returns:
      list of explicitly added media supports

    • services

      public List<WebClientService> services()
      WebClient services.
      Returns:
      services to use with this web client

    • relativeUris

      public boolean relativeUris()
      Can be set to true to force the use of relative URIs in all requests, regardless of the presence or absence of proxies or no-proxy lists.
      Returns:
      relative URIs flag

    • executor

      public Optional<ExecutorService> executor()
      Client executor service.
      Returns:
      executor service to use when needed (such as for HTTP/2)

    • sendExpectContinue

      public boolean sendExpectContinue()
      Whether Expect-100-Continue header is sent to verify server availability before sending an entity.

      Defaults to true.

      Returns:
      whether Expect:100-Continue header should be sent on streamed transfers

    • connectionCacheSize

      public int connectionCacheSize()
      Maximal size of the connection cache for a single connection key. A connection key is formed by the scheme, host, port, TLS configuration, DNS resolver, DNS address lookup, and proxy.

      For most HTTP protocols, we may cache connections to various endpoints for keep alive (or stream reuse in case of HTTP/2). This option limits the size. Setting this number lower than the "usual" number of target services will cause connections to be closed and reopened frequently.

    • cookieManager

      public Optional<WebClientCookieManager> cookieManager()
      WebClient cookie manager.
      Returns:
      cookie manager to use

    • readContinueTimeout

      public Duration readContinueTimeout()
      Socket 100-Continue read timeout. Default is 1 second. This read timeout is used when 100-Continue is sent by the client, before it sends an entity.
      Returns:
      read 100-Continue timeout duration

    • shareConnectionCache

      public boolean shareConnectionCache()
      Whether to share connection cache between all the WebClient instances in JVM.
      Returns:
      true if connection cache is shared

    • maxInMemoryEntity

      public int maxInMemoryEntity()
      If the entity is expected to be smaller that this number of bytes, it would be buffered in memory to optimize performance. If bigger, streaming will be used.

      Note that for some entity types we cannot use streaming, as they are already fully in memory (String, byte[]), for such cases, this option is ignored. Default is 128Kb.

      Returns:
      maximal number of bytes to buffer in memory for supported writers

    • writeBufferSize

      public int writeBufferSize()
      Buffer size used when writing data to the underlying socket on a client TCP connection. A value that is less or equal to 1 can be set to disable buffering at this level. Note that if writing data to the socket in small chunks, they may not be delivered to the network immediately due to Nagle's algorithm (i.e., if TCP_NO_DELAY is turned off).
      Returns:
      number of bytes in write buffer

    • connectionListener

      public ConnectionListener connectionListener()
      Socket lifecycle callbacks. The default implementation does nothing, and Initializer logic that is called immediately after the client connection is established, before any TLS or HTTP data is written. The default initializer does nothing.
      Returns:
      The socket listener.

    • servicesDiscoverServices

      public boolean servicesDiscoverServices()
      Service discovery flag for services(). If set to true, services will be discovered from Java service loader, or Helidon ServiceRegistry.
      Returns:
      whether to enable automatic service discovery

    • toString

      public String toString()
      Overrides:
      toString in class HttpConfigBase.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>

    • preBuildPrototype

      protected void preBuildPrototype()
      Handles providers and decorators.
      Overrides:
      preBuildPrototype in class HttpConfigBase.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>

    • validatePrototype

      protected void validatePrototype()
      Validates required properties.
      Overrides:
      validatePrototype in class HttpConfigBase.BuilderBase<BUILDER extends HttpClientConfig.BuilderBase<BUILDER,PROTOTYPE>,PROTOTYPE extends HttpClientConfig>