243.10. 实施反向代理

Netty4 组件可以充当反向代理。这意味着这些标头从 HTTP 请求请求行中收到的绝对 URL 填充：

Exchange.HTTP_SCHEME
Exchange.HTTP_HOST
Exchange.HTTP_PORT

HTTP 标头干扰

HTTP 标头可能会干扰客户端或下游处理。

例如，如果更改了 HTTP 正文，则需要重新计算或删除 Content-Length 标头来反映更改。

在以下示例中，HTTP 代理将响应从原始服务器转换为大写：

Example

from("netty-http:proxy://0.0.0.0:8080")
    .toD("netty-http:"
        + "${headers." + Exchange.HTTP_SCHEME + "}://"
        + "${headers." + Exchange.HTTP_HOST + "}:"
        + "${headers." + Exchange.HTTP_PORT + "}")
    .process(this::processResponse);

void processResponse(final Exchange exchange) {
    final NettyHttpMessage message = exchange.getIn(NettyHttpMessage.class);
    final FullHttpResponse response = message.getHttpResponse();

    final ByteBuf buf = response.content();
    final String string = buf.toString(StandardCharsets.UTF_8);

    buf.resetWriterIndex();
    ByteBufUtil.writeUtf8(buf, string.toUpperCase(Locale.US));
}

from("netty-http:proxy://0.0.0.0:8080")
    .toD("netty-http:"
        + "${headers." + Exchange.HTTP_SCHEME + "}://"
        + "${headers." + Exchange.HTTP_HOST + "}:"
        + "${headers." + Exchange.HTTP_PORT + "}")
    .process(this::processResponse);

void processResponse(final Exchange exchange) {
    final NettyHttpMessage message = exchange.getIn(NettyHttpMessage.class);
    final FullHttpResponse response = message.getHttpResponse();

    final ByteBuf buf = response.content();
    final String string = buf.toString(StandardCharsets.UTF_8);

    buf.resetWriterIndex();
    ByteBufUtil.writeUtf8(buf, string.toUpperCase(Locale.US));
}

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243.10. 实施反向代理

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