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HttpObject
HttpObject 是所有 HTTP 消息对象的父接口，继承 DecoderResultProvider，表示它们都能提供解码结果。
public interface HttpObject extends DecoderResultProvider {}
DecoderResultProvider
DecoderResultProvider是定义了获取和设置解码结果（DecoderResult）的方法的接口。
public interface DecoderResultProvider {DecoderResult decoderResult();void setDecoderResult(DecoderResult result);
}
DecoderResult
DecoderResult 是一个标准的解码状态表示类，封装了是否成功和失败原因。
public class DecoderResult {private static final DecoderResult SUCCESS = new DecoderResult();public static DecoderResult failure(Throwable cause) {requireNonNull(cause, "cause");return new DecoderResult(cause);}public static DecoderResult success() {return SUCCESS;}private final Throwable cause;protected DecoderResult(Throwable cause) {this.cause = requireNonNull(cause, "cause");}protected DecoderResult() {this.cause = null;}public final boolean isSuccess() {return cause == null;}public final boolean isFailure() {return cause != null;}public final Throwable cause() {return cause;}@Overridepublic String toString() {if (isSuccess()) {return "success";}String cause = cause().toString();return new StringBuilder(cause.length() + 17).append("failure(").append(cause).append(')').toString();}
}
HttpContent
HttpContent 表示HTTP消息的内容体（body），它能给你拿到数据（payload()），还能复制一份内容（copy()）
public interface HttpContent<R extends HttpContent<R>> extends HttpObject, Resource<R> {Buffer payload();R copy();
}
LastHttpContent
LastHttpContent 是HttpContent的子接口，表示消息体的最后一块数据，还能拿到额外的尾部头信息（trailingHeaders()），比如分块传输时用。
public interface LastHttpContent<R extends LastHttpContent<R>> extends HttpContent<R> {HttpHeaders trailingHeaders();
}
HttpMessage
代表一条HTTP消息的基础抽象，有协议版本（protocolVersion()）和消息头（headers()），能设置协议版本。
public interface HttpMessage extends HttpObject {HttpVersion protocolVersion();HttpMessage setProtocolVersion(HttpVersion version);HttpHeaders headers();
}
HttpRequest
HttpRequest 是HttpMessage的请求版本，带请求方法（GET/POST等）和请求地址URI。
public interface HttpRequest extends HttpMessage {HttpMethod method();HttpRequest setMethod(HttpMethod method);String uri();HttpRequest setUri(String uri);@OverrideHttpRequest setProtocolVersion(HttpVersion version);
}
HttpResponse
HttpResponse 是HttpMessage的响应版本，带响应状态码（200 OK，404等）。
public interface HttpResponse extends HttpMessage {HttpResponseStatus status();HttpResponse setStatus(HttpResponseStatus status);@OverrideHttpResponse setProtocolVersion(HttpVersion version);
}
FullHttpMessage
继承了HttpMessage和LastHttpContent，表示既有完整头信息又有完整内容体的HTTP消息。
public interface FullHttpMessage<R extends FullHttpMessage<R>> extends HttpMessage, LastHttpContent<R> {}
FullHttpRequest
FullHttpRequest 是带完整头和体的 HTTP 请求对象
public interface FullHttpRequest extends HttpRequest, FullHttpMessage<FullHttpRequest> {@OverrideFullHttpRequest setProtocolVersion(HttpVersion version);@OverrideFullHttpRequest setMethod(HttpMethod method);@OverrideFullHttpRequest setUri(String uri);
}
FullHttpResponse
FullHttpResponse 是带完整头和体的 HTTP 响应对象。
public interface FullHttpResponse extends HttpResponse, FullHttpMessage<FullHttpResponse> {@OverrideFullHttpResponse setProtocolVersion(HttpVersion version);@OverrideFullHttpResponse setStatus(HttpResponseStatus status);
}