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我在负载均衡器后面有一个 lambda。我正在尝试从 lambda 返回一个 zip 文件（二进制内容）。由于响应类型是 application/octet-stream，因此响应是 base 64 编码的代码，并且 isbase64encoded 标志设置为 true。

期望是当此标志打开时，ALB 将在将响应发送到浏览器之前对其进行解码，但这并没有发生。

需要注意的是，我正在使用 AWS 无服务器 Java 容器库（https://github.com/awslabs/aws-serverless-java-container/tree/master/aws-serverless-java-container-springboot2）在 lambda 中运行 Web 服务在 ALB 后面

对于 Lambda 日志、请求、响应标头和代码，请参见下文

Lambda 日志：-

[2021-05-27/13:43:51.805/UTC][INFO ][main][c.a.s.p.i.LambdaContainerHandler] ; 127.0.0.1 null- null [27/05/2021:13:43:51Z] "GET /downloadZip null" 200 403 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36" combined
[2021-05-27/13:43:51.805/UTC][INFO ][main][c.a.s.p.i.LambdaContainerHandler] ; 127.0.0.1 null- null [27/05/2021:13:43:51Z] "GET /downloadZip null" 200 403 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36" combined

响应标头：-

content-disposition: attachment;filename=download.zip
content-length: 740
content-type: application/octet-stream
date: Thu, 27 May 2021 13:43:51 GMT
server: awselb/2.0

请求标头（浏览器）：-

:authority: ddvs-ci-binary-lambda.ihsmvals-dev.com
:method: GET
:path: /downloadZip
:scheme: https
accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
accept-encoding: gzip, deflate, br
accept-language: en-US,en;q=0.9
sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
sec-ch-ua-mobile: ?0
sec-fetch-dest: document
sec-fetch-mode: navigate
sec-fetch-site: none
sec-fetch-user: ?1
upgrade-insecure-requests: 1
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

代码：-

@GetMapping("/downloadZip")
public void downloadFile(HttpServletResponse response) {

    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment;filename=download.zip");
    response.setStatus(HttpServletResponse.SC_OK);

    try (ZipOutputStream zippedOut = new ZipOutputStream(response.getOutputStream())) {
            Resource resource = new ClassPathResource("logback.xml");
            //FileSystemResource resource = new FileSystemResource(file);

            ZipEntry e = new ZipEntry(resource.getFilename());
            // Configure the zip entry, the properties of the file
            e.setSize(resource.contentLength());
            e.setTime(System.currentTimeMillis());
            // etc.
            zippedOut.putNextEntry(e);
            // And the content of the resource:
            StreamUtils.copy(resource.getInputStream(), zippedOut);
            zippedOut.closeEntry();

        zippedOut.finish();
    } catch (Exception e) {
        // Exception handling goes here
    }
}

这是对二进制响应类型的响应进行编码的位

if (!this.isBinary(containerResponse.getContentType()) && this.isValidUtf8(containerResponse.getAwsResponseBodyBytes())) { responseString = containerResponse.getAwsResponseBodyString(); } else { responseString = Base64.getEncoder().encodeToString(containerResponse.getAwsResponseBodyBytes()); awsProxyResponse.setBase64Encoded(true); }

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