Nginx-echo可以在Nginx中用来输出一些信息，是在测试排错过程中一个比较好的工具。它也可以做到把来自不同链接地址的信息进行一个汇总输出。总之能用起来可以给开发人员带来挺大帮助的。下面看看我们如何去安装使用它。
1.下载Nginx-echo
cd /usr/local/nginx-1.12./
wget https://github.com/openresty/echo-nginx-module/archive/v0.60.tar.gz
2.解压下载来的文件
tar zxvf v0..tar.gz
3.查看一下之前安装的模块
/usr/local/nginx/sbin/nginx -V
4.进入以前下载过来的Nginx安装包目录下配置
cd /usr/local/nginx-1.12./
./configure --add-module=/usr/local/nginx-1.12./echo-nginx-module-0.61 --add-module=/usr/local/nginx-1.12./ngx_image_thumb-master
5.编译安装，如果是升级可以使用make upgrade
make && make install
6.使用echo，以下内容为官方的案例，加了一些自己的理解
#简单输出，看别人日志地址是/hello，我这里测试后不知道为什么一直访问不到，所以加上/
location /hello/ {
echo "hello, world!";
} #$echo_timer_elapsed计时，通过echo_reset_timer执行后开始计算
location /timed_hello/ {
echo_reset_timer;
echo hello world;
echo "'hello world' takes about $echo_timer_elapsed sec.";
echo hiya igor;
echo "'hiya igor' takes about $echo_timer_elapsed sec.";
} #echo_sleep可以等待2.5s后再输出
location /echo_with_sleep/ {
echo hello;
echo_flush; # ensure the client can see previous output immediately
echo_sleep 2.5; # in sec
echo world;
} #在proxy_pass这个地址获得的源代码前后加上指定的内容
location /echo/ {
echo_before_body hello;
echo_before_body world;
proxy_pass $scheme://127.0.0.1:$server_port$request_uri/more;
echo_after_body hiya;
echo_after_body igor;
} #echo_location_async可以异步去访问其他地址，不影响当前函数执行，$echo_timer_elapsed最后输出的值为0
location /main/ {
echo_reset_timer; # subrequests in parallel
echo_location_async /sub1/;
echo_location_async /sub2/; echo "took $echo_timer_elapsed sec for total.";
}
location /sub1/ {
echo_sleep ;
echo hello;
}
location /sub2/ {
echo_sleep ;
echo world;
} #同步执行
location /main/ {
echo_reset_timer; # subrequests in series (chained by CPS)
echo_location /sub1/;
echo_location /sub2/; echo "took $echo_timer_elapsed sec for total.";
}
location /sub1/ {
echo_sleep ;
echo hello;
}
location /sub2/ {
echo_sleep ;
echo world;
} #echo_duplicate 3 "--" 意思是重复3次输出"--"
location /dup/ {
echo_duplicate "--";
echo_duplicate " END ";
echo_duplicate "--";
echo;
} #输出客户端请求的信息
location /echoback/ {
echo_duplicate $echo_client_request_headers;
echo "\r"; echo_read_request_body;
echo_request_body;
} #输出querystring、method、body、content等信息
location /multi {
echo_subrequest_async POST '/sub' -q 'foo=Foo' -b 'hi';
echo_subrequest_async PUT '/sub' -q 'bar=Bar' -b 'hello';
}
location /sub {
echo "querystring: $query_string";
echo "method: $echo_request_method";
echo "body: $echo_request_body";
echo "content length: $http_content_length";
echo '///';
} #可以将多个JS合并到一个URL地址输出
# GET /merge?/foo.js&/bar/blah.js&/yui/baz.js will merge the .js resources together
location /merge {
default_type 'text/javascript';
echo_foreach_split '&' $query_string;
echo "/* JS File $echo_it */";
echo_location_async $echo_it;
echo;
echo_end;
} #如果地址为/if/?val=abcd，则输出hit
#参数名为val，参数值以a开头
location /if/ {
set $res miss;
if ($arg_val ~* '^a') {
set $res hit;
echo $res;
}
echo $res;
}