nginx的chunked_transfer_encoding没有生效 400 请求报错 

这个值默认就是on啊: http://nginx.org/en/docs/http/ngx_http_core_module.html#chunked_transfer_encoding
最后就是，你没理解chunked_transfer_encoding的含义，这个选项是否开启不会影响content-length。
我这个服务器也是用nginx实现反向代理的。我用curl请求，打印请求头看看:

~$ curl -I http://172.16.250.11/front/monitor HTTP/1.1 200 OK Server: nginx Date: Mon, 01 Feb 2016 11:55:21 GMT Content-Type: text/html;charset=UTF-8 Content-Length: 14651 Connection: keep-alive Vary: Accept-Encoding Set-Cookie: JSESSIONID=6A766B1362D24A17C2EC86D213FD01EA; Path=/; HttpOnly Set-Cookie: token=1454327721220; Path=/ Content-Language: en-US

~$ curl -I -H 'Accept-Encoding:gzip' http://172.16.250.11/front/monitor HTTP/1.1 200 OK Server: nginx Date: Mon, 01 Feb 2016 11:55:55 GMT Content-Type: text/html;charset=UTF-8 Connection: keep-alive Vary: Accept-Encoding Set-Cookie: JSESSIONID=220A7F1826A75727EC9F8E2A3D058797; Path=/; HttpOnly Set-Cookie: token=1454327755777; Path=/ Content-Language: en-US Content-Encoding: gzip

可以看到当服务器使用gzip压缩的文件时，由于事先不知道文件大小，是没有Content-Length头的。请求的都是同一个资源 ######我把nginx当做一个web服务器，使用curl直接请求，没有 chunked_transfer_encoding，只有Content-Length###### 这个就是我请求的内容
[root@ ~]# curl -I  http://172.16.0.217/index.html                          HTTP/1.1 200 OK

Server: nginx/1.8.0

Date: Tue, 02 Feb 2016 02:18:13 GMT

Content-Type: text/html

Content-Length: 612

Last-Modified: Mon, 01 Feb 2016 07:34:41 GMT

Connection: keep-alive

ETag: "56af0a91-264"

Accept-Ranges: bytes

######补充一下，不要去纠结 Transfer-Encoding: chuncked这个头。其实最佳的方式是Vary: Accept-Encoding######因为这个文件是固定大小的啊，服务器可以事先知道文件大小，自然能返回Content-Length。你试试让服务器返回gzip压缩的文件。curl -H 'Accept-Encoding:gzip'再请求看看###### 还是不行，就连Content-Encoding都没有显示
[root@ conf]# curl -I -H 'Accept-Encoding:gzip'  http://172.16.0.217/hls/1-1.ts HTTP/1.1 200 OK

Server: nginx/1.8.0

Date: Tue, 02 Feb 2016 03:17:53 GMT

Content-Type: video/mp2t

Content-Length: 750120

Last-Modified: Mon, 01 Feb 2016 09:45:43 GMT

Connection: keep-alive

ETag: "56af2947-b7228"

Accept-Ranges: bytes

######回复 @Feng_Yu : 你可以看看各种服务器的配置，几乎都对jpg,png,mp4等这一类多媒体文件不启用gzip压缩——实在是没必要######这个是对的，多媒体文件本身就有无损压缩的算法在里面，自身的冗余度很小，所以再用无损压缩算法gzip简直是吃力不讨好。所以多媒体文件几乎都不需要使用gzip，自然没有gzip编码啊###### 是因为我刚刚在配置文件没有配置gzip_types这个参数；配置上了之后，我在请求
< Server: nginx/1.8.0 < Date: Tue, 02 Feb 2016 03:34:50 GMT < Content-Type: video/mp2t < Last-Modified: Mon, 01 Feb 2016 09:45:43 GMT < Connection: keep-alive < ETag: W/"56af2947-b7228" < Content-Encoding: gzip * no chunk, no close, no size. Assume close to signal end ######这个竟然是 no chunk, no close, no size. Assume close to signal end###### @vicky1992
能否贴一下你的配置?我这边用curl跑就没这个问题

─$ curl -svH 'Accept-Encoding:gzip' 172.16.250.11/upload/docs/mytest.pdf -o /dev/null 
* Hostname was NOT found in DNS cache
*   Trying 172.16.250.11...
* Connected to 172.16.250.11 (172.16.250.11) port 80 (#0)
> GET /upload/docs/mytest.pdf HTTP/1.1
> User-Agent: curl/7.35.0
> Host: 172.16.250.11
> Accept: */*
> Accept-Encoding:gzip
> 
< HTTP/1.1 200 OK
* Server nginx is not blacklisted
< Server: nginx
< Date: Tue, 02 Feb 2016 03:49:28 GMT
< Content-Type: application/pdf
< Content-Length: 981296
< Last-Modified: Tue, 02 Feb 2016 03:46:57 GMT
< Connection: keep-alive
< Expires: Tue, 09 Feb 2016 03:49:28 GMT
< Cache-Control: max-age=604800
< Accept-Ranges: bytes
< 
{ [data not shown]
* Connection #0 to host 172.16.250.11 left intact

我主要是想在http头返回Transfer-Encoding: chunked

我的配置
gzip  on; gzip_min_length 1100; gzip_buffers 4 8k; gzip_types application/vnd.apple.mpegurl video/mp2t; output_buffers 1 32k; postpone_output 1460; ###### @vicky1992
对pdf文件启用了一下gzip。重新请求一次，这次是有chunked头的
我的nginx版本是1.8.1，最新稳定版本，绝大多数配置都用的是默认。

─$ curl -svH 'Accept-Encoding:gzip' 172.16.250.11/upload/docs/mytest.pdf -o /dev/null * Hostname was NOT found in DNS cache *   Trying 172.16.250.11... * Connected to 172.16.250.11 (172.16.250.11) port 80 (#0) > GET /upload/docs/mytest.pdf HTTP/1.1 > User-Agent: curl/7.35.0 > Host: 172.16.250.11 > Accept: / > Accept-Encoding:gzip > < HTTP/1.1 200 OK * Server nginx is not blacklisted < Server: nginx < Date: Tue, 02 Feb 2016 03:54:03 GMT < Content-Type: application/pdf < Last-Modified: Tue, 02 Feb 2016 03:46:57 GMT < Transfer-Encoding: chunked < Connection: keep-alive < Vary: Accept-Encoding < Expires: Tue, 09 Feb 2016 03:54:03 GMT < Cache-Control: max-age=604800 < Content-Encoding: gzip < { [data not shown] * Connection #0 to host 172.16.250.11 left intact

配置文件的参考:

nginx.conf:

user www-data; worker_processes auto; pid /run/nginx.pid;

events { worker_connections 768; multi_accept on; }

http { sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; server_tokens off; etag off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_min_length 1000;
gzip_types text/* application/json application/javascript application/xml application/xml+rss
           application/x-javascript application/xhtml+xml application/vnd.ms-excel application/pdf;

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;

}

/etc/nginx/sites-enabled/default:

server {
	listen 80 default_server;
	root /var/www/html;
	index index.html index.htm index.nginx-debian.html;
	etag off;
	client_max_body_size 10m;
	client_body_buffer_size 128k;
	port_in_redirect off;
        ...   省略非关键部分  ...
	location ^~ /upload {
		if ($invalid_referer) {
			return 403;
		}
		alias /mnt/aircare;
		expires 7d;
		location ~* \.(png|jpg|gif)$ {
			error_page 404 /assets/unknown.png;
			error_page   415 /empty;
			set $width -;
			set $height -;

			if ($arg_w) {
				set $width $arg_w;
			}

			if ($arg_h) {
				set $height $arg_h;
			}

			image_filter resize $width $height;
			image_filter_buffer 10M;
		}

		location ^~ /upload/images/security {
			return 403;
		}
	}
}

######我现在加上 'Accept-Encoding:gzip' 有chunked了，可是再去请求被nginx GZIP后的内容，发现解析不了######有压缩价值的基本也就是文本文件了，压缩率很高。其余二进制文件未必，需要自己实验。多媒体文件由于自带无损压缩算法，几乎不用gzip压缩。######请求过的内容是gzip压缩过的啊，你解压不就行了？浏览器会自动帮你解压，终端可以用curl | gunzip 即可