Apache mod_filter：为什么替换不适用于某些URL？

我将mod proxy与mod filter结合使用，以便从网络外部访问内部服务器（nginx）。我的过滤器配置为：

SetEnv filter-errordocs # necessary to process requests which don't have HTTP 200 OK
FilterDeclare ghe
FilterProvider gzinflate INFLATE resp=Content-Encoding $gzip
FilterProvider ghe SUBSTITUTE resp=Content-Type $text/
FilterProvider gzdeflate DEFLATE Content-Type $text/
FilterChain +gzinflate +ghe +gzdeflate
FilterTrace ghe 1

这适用于HTML页面，对于

curl-Ihttp://internal/url

提供了如下内容：

HTTP/1.1 200 OK
Server: server.com
Date: Sat, 10 Aug 2013 14:55:25 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Status: 200 OK
Cache-Control: no-cache, no-store
X-Frame-Options: deny
Set-Cookie: logged_in=no; domain=.192.168.120.128; path=/; expires=Wed, 10-Aug-2033 14:55:25 GMT; HttpOnly
Set-Cookie: _fi_sess=xyz HttpOnly
X-Runtime: 19
ETag: "zyx"
Content-Length: 5928

HTTP/1.1 200 OK
Server: server.com
Date: Sat, 10 Aug 2013 14:55:31 GMT
Content-Type: text/css
Content-Length: 269455
Last-Modified: Fri, 09 Aug 2013 14:23:05 GMT
Connection: keep-alive
Accept-Ranges: bytes

但是，当访问

curl-I的css文件时，它不起作用http://internal/url.css

提供了如下内容：

HTTP/1.1 200 OK
Server: server.com
Date: Sat, 10 Aug 2013 14:55:25 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Status: 200 OK
Cache-Control: no-cache, no-store
X-Frame-Options: deny
Set-Cookie: logged_in=no; domain=.192.168.120.128; path=/; expires=Wed, 10-Aug-2033 14:55:25 GMT; HttpOnly
Set-Cookie: _fi_sess=xyz HttpOnly
X-Runtime: 19
ETag: "zyx"
Content-Length: 5928

HTTP/1.1 200 OK
Server: server.com
Date: Sat, 10 Aug 2013 14:55:31 GMT
Content-Type: text/css
Content-Length: 269455
Last-Modified: Fri, 09 Aug 2013 14:23:05 GMT
Connection: keep-alive
Accept-Ranges: bytes

这个问题在Apache的错误日志（带有调试日志级别）中是可见的。对于应用了过滤器的URL，我看到类似的情况（但不确定

EOS

-部分是否是相同的请求）：

对于未应用筛选器的URL，我只看到如下内容：

[Sat Aug 10 16:44:27 2013] [debug] mod_headers.c(756): headers: ap_headers_output_filter()
[Sat Aug 10 16:44:27 2013] [debug] mod_filter.c(117): [client 192.168.93.201] ghe
[Sat Aug 10 16:44:27 2013] [debug] mod_filter.c(122): [client 192.168.93.201] ghe: type: EOS, length: 0

所以，只要

EOS

，但没有

HEAP

，如果这意味着什么的话

---

如何解决这个问题

SUBSTITUTE

过滤器可能无法与

接受范围：字节一起工作。使用mod header并向Apache配置文件添加以下行：

Header set Accept-Ranges "none"

将使过滤器工作