.htaccess AddOutputFilter失败

Question

我目前启用GZIP，如下所示：

# gzip compression
<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x-javascript application/javascript application/json
</ifmodule>

这会产生这样的响应头：

​

​

注意，Content-Encoding设置为gzip，Vary也被设置。

现在，我想使用来自这个.htaccess文件的代码，这可以提高性能，但是当我将上面的代码替换为下面的代码时：

# --------------------------------------------------------------------------------------
# Compression: http://code.google.com/speed/page-speed/docs/payload.html#GzipCompression
# --------------------------------------------------------------------------------------
<IfModule mod_deflate.c>
AddOutputFilter DEFLATE application/atom+xml
AddOutputFilter DEFLATE application/json
AddOutputFilter DEFLATE application/xhtml+xml
AddOutputFilter DEFLATE application/xml
AddOutputFilter DEFLATE text/css
AddOutputFilter DEFLATE text/html
AddOutputFilter DEFLATE text/plain
AddOutputFilter DEFLATE text/x-component
AddOutputFilter DEFLATE text/xml

# The following MIME types are in the process of registration
AddOutputFilter DEFLATE application/xslt+xml
AddOutputFilter DEFLATE image/svg+xml

# The following MIME types are NOT registered
AddOutputFilter DEFLATE application/mathml+xml
AddOutputFilter DEFLATE application/rss+xml

# JavaScript has various MIME types
AddOutputFilter DEFLATE application/javascript
AddOutputFilter DEFLATE application/x-javascript
AddOutputFilter DEFLATE text/ecmascript
AddOutputFilter DEFLATE text/javascript

# .ico files and other compressible images
AddOutputFilter DEFLATE image/vnd.microsoft.icon
AddOutputFilter DEFLATE image/x-icon
AddOutputFilter DEFLATE image/bmp
AddOutputFilter DEFLATE image/tiff
AddOutputFilter DEFLATE application/pdf

# compressible fonts (.woff is already compressed)
AddOutputFilter DEFLATE font/opentype
AddOutputFilter DEFLATE application/x-font-ttf
AddOutputFilter DEFLATE application/vnd.ms-fontobject
</IfModule>

同一文件请求的响应头如下：

​

​

Content-Encoding: gzip头不再存在。另外，Transfer-Encoding和Vary现在也不见了。

这里发生了什么事？为什么这个新代码无法将文件压缩？

Answer 1

AddOutputFilterByType接受媒体类型，在本例中是：

application/json

AddOutputFilter接受文件扩展名，在本例中是：

json

参考资料

• 核心特性
• mod mime
• mod滤波器
• 配置服务器MIME类型
• 常见的HTTP实现问题(芯片)
• 权威MetaData