为什么不遵守gzip最小长度指令？

Question

如果我理解正确,最好不要使用gzip小资源,因为它们实际上可能会变得更大,同时仍然会在CPU上遇到性能损失.所以使用gzip_min_length指令是一个明显的解决方案.但是,在运行REST API的服务器上尝试此操作时,我正在进行此操作似乎不起作用.当我收到空的json响应或非常小的响应时,Content-Encoding标头仍然存在并且正在读取"gzip".

HTTP响应标头

我的问题是为什么这个设置不被NginX尊重,我该怎么做才能修复它？

API建立在Lumen微框架上.

我已经在我的nginx.conf中附加了我正在使用的Gzip设置:

  # Compression

  # Enable Gzip compressed.
  gzip on;

  # Enable compression both for HTTP/1.0 and HTTP/1.1.
  gzip_http_version  1.1;

  # Compression level (1-9).
  # 5 is a perfect compromise between size and cpu usage, offering about
  # 75% reduction for most ascii files (almost identical to level 9).
  gzip_comp_level    5;

  # Don't compress anything that's already small and unlikely to shrink much
  # if at all (the default is 20 bytes, which is bad as that usually leads to
  # larger files after gzipping).
  gzip_min_length    1000;

  # Compress data even for clients that are connecting to us via proxies,
  # identified by the "Via" header (required for CloudFront).
  gzip_proxied       any;

  # Tell proxies to cache both the gzipped and regular version of a resource
  # whenever the client's Accept-Encoding capabilities header varies;
  # Avoids the issue where a non-gzip capable client (which is extremely rare
  # today) would display gibberish if their proxy gave them the gzipped version.
  gzip_vary          on;

  # Compress all output labeled with one of the following MIME-types.
  gzip_types
    application/atom+xml
    application/javascript
    application/json
    application/rss+xml
    application/vnd.ms-fontobject
    application/x-font-ttf
    application/x-web-app-manifest+json
    application/xhtml+xml
    application/xml
    font/opentype
    image/svg+xml
    image/x-icon
    text/css
    text/plain
    text/x-component;
  # text/html is always compressed by HttpGzipModule

Answer 1

确认上面的注释,这似乎与NGINX gzip模块文档中的注释相对应,该文档说明"长度仅由"Content-Length"响应头字段确定."

有了gzip_min_length 1000;,我的JSON响应被gzip'ed,即使它们只有100个字节.

我更改了我的应用程序以添加Content-Length: 100标头,NGINX发送JSON响应而不使用gzip编码.

如果我将配置更改为gzip_min_length 80;具有相同的100字节Content-Length,则NGINX会按预期应用gzip编码.

简短说明:您需要应用Content-LengthNGINX 的标题来正确处理gzip_min_length检查.