Nginx 服务器上的 AJAX 请求忽略异步

Question

尽管通过 AJAX 向服务器发送了异步请求，但服务器直到前一个不相关的请求完成才会响应。以下代码仅在 Nginx 上以这种方式损坏，但在 Apache 上运行良好。

此调用将启动一个后台进程并等待其完成以便显示最终结果。

$.ajax({
    type: 'GET',
    async: true,
    url: $(this).data('route'),
    data: $('input[name=data]').val(),
    dataType: 'json',
    success: function (data) { /* do stuff */}
    error: function (data) { /* handle errors */}
});

下面的命令在上面的命令之后调用，在 Apache 上需要 100ms 来执行并重复，显示后台写入数据的进度：

checkStatusInterval = setInterval(function () {
    $.ajax({
        type: 'GET',
        async: false,
        cache: false,
        url: '/process-status?process=' + currentElement.attr('id'),
        dataType: 'json',
        success: function (data) { /* update progress bar and status message */ }
    });
}, 1000);

不幸的是，当从 nginx 运行此脚本时，上述进度请求甚至在第一个发送数据的 AJAX 请求完成之前都不会完成任何请求。如果我将上面的 async 更改为 TRUE，它会在每个间隔执行一次，但直到第一个 AJAX 请求完成之前，它们都不会完成。

这是主要的 nginx conf 文件：

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    server_names_hash_bucket_size 64;

    # configure temporary paths
    # nginx is started with param -p, setting nginx path to serverpack installdir
    fastcgi_temp_path temp/fastcgi;
    uwsgi_temp_path temp/uwsgi;
    scgi_temp_path temp/scgi;
    client_body_temp_path temp/client-body 1 2;
    proxy_temp_path temp/proxy;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                  '$status $body_bytes_sent "$http_referer" '
                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    # Sendfile copies data between one FD and other from within the kernel.
    # More efficient than read() + write(), since the requires transferring data to and from the user space.
    sendfile on;

    # Tcp_nopush causes nginx to attempt to send its HTTP response head in one packet,
    # instead of using partial frames. This is useful for prepending headers before calling sendfile,
    # or for throughput optimization.
    tcp_nopush on;

    # don't buffer data-sends (disable Nagle algorithm). Good for sending frequent small bursts of data in real time.
    tcp_nodelay on;

    types_hash_max_size 2048;

    # Timeout for keep-alive connections. Server will close connections after this time.
    keepalive_timeout 90;

    # Number of requests a client can make over the keep-alive connection. This is set high for testing.
    keepalive_requests 100000;

    # allow the server to close the connection after a client stops responding. Frees up socket-associated memory.
    reset_timedout_connection on;

    # send the client a "request timed out" if the body is not loaded by this time. Default 60.
    client_header_timeout   20;
    client_body_timeout 60;

    # If the client stops reading data, free up the stale client connection after this much time. Default 60.
    send_timeout 60;

    # Size Limits
    client_body_buffer_size   64k;
    client_header_buffer_size 4k;
    client_max_body_size      8M;

    # FastCGI
    fastcgi_connect_timeout 60;
    fastcgi_send_timeout 120;
    fastcgi_read_timeout 300; # default: 60 secs; when step debugging with XDEBUG, you need to increase this value
    fastcgi_buffer_size 64k;
    fastcgi_buffers 4 64k;
    fastcgi_busy_buffers_size 128k;
    fastcgi_temp_file_write_size 128k;

    # Caches information about open FDs, freqently accessed files.
    open_file_cache max=200000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    # Turn on gzip output compression to save bandwidth.
    # http://wiki.nginx.org/HttpGzipModule
    gzip  on;
    gzip_disable "MSIE [1-6]\.(?!.*SV1)";
    gzip_http_version 1.1;
    gzip_vary on;
    gzip_proxied any;
    #gzip_proxied expired no-cache no-store private auth;
    gzip_comp_level 6;
    gzip_buffers 16 8k;
    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript;

    # show all files and folders
    autoindex on;

    server {
        # access from localhost only
        listen       127.0.0.1:80;
        server_name  localhost;
        root         www;

        # the following default "catch-all" configuration, allows access to the server from outside.
        # please ensure your firewall allows access to tcp/port 80. check your "skype" config.
        # listen       80;
        # server_name  _;

        log_not_found off;
        charset utf-8;

        access_log  logs/access.log  main;

        # handle files in the root path /www
        location / {
            index  index.php index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   www;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9100
        #
        location ~ \.php$ {
            try_files      $uri =404;
            fastcgi_pass   127.0.0.1:9100;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }

        # add expire headers
        location ~* ^.+.(gif|ico|jpg|jpeg|png|flv|swf|pdf|mp3|mp4|xml|txt|js|css)$ {
            expires 30d;
        }

        # deny access to .htaccess files (if Apache's document root concurs with nginx's one)
        # deny access to git & svn repositories
        location ~ /(\.ht|\.git|\.svn) {
            deny  all;
        }
    }

    # include config files of "enabled" domains
    include domains-enabled/*.conf;
}

这是启用的域配置文件：

access_log  off;
access_log  C:/server/www/test.dev/logs/access.log;
error_log   C:/server/www/test.dev/logs/error.log;

# HTTP Server
server {
    listen 127.0.0.1:80;
    server_name test.dev;
    root        C:/server/www/test.dev/public;
    index       index.php;
    rewrite_log on;
    default_type    application/octet-stream;
    #include    /etc/nginx/mime.types;

    # Include common configurations.
    include     domains-common/location.conf;
}

# HTTPS server
server {
    listen      443 ssl;
    server_name test.dev;
    root        C:/server/www/test.dev/public;
    index       index.php;
    rewrite_log on;
    default_type    application/octet-stream;
    #include    /etc/nginx/mime.types;

    # Include common configurations.
    include     domains-common/location.conf;
    include     domains-common/ssl.conf;
}

ssl.conf的内容：

# OpenSSL for HTTPS connections.
ssl                  on;
ssl_certificate      C:/server/bin/openssl/certs/cert.pem;
ssl_certificate_key  C:/server/bin/openssl/certs/cert.key;
ssl_session_timeout  5m;
ssl_protocols              SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers                HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers  on;

# Pass the PHP scripts to FastCGI server listening on 127.0.0.1:9100
location ~ \.php$ {
    try_files      $uri =404;
    fastcgi_param  HTTPS on;
    fastcgi_pass   127.0.0.1:9100;
    fastcgi_index  index.php;
    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    include        fastcgi_params;
}

location.conf的内容：

# Remove trailing slash to please Laravel routing system.
if (!-d $request_filename) {
    rewrite  ^/(.+)/$ /$1 permanent;
}

location / {
    try_files $uri $uri/ /index.php?$query_string;
}

# We don't need .ht files with nginx.
location ~ /(\.ht|\.git|\.svn) {
    deny  all;
}

# Added cache headers for images.
location ~* \.(png|jpg|jpeg|gif)$ {
    expires 30d;
    log_not_found off;
}

# Only 3 hours on CSS/JS to allow me to roll out fixes during early weeks.
location ~* \.(js|css)$ {
    expires 3h;
    log_not_found off;
}

# Add expire headers.
location ~* ^.+.(gif|ico|jpg|jpeg|png|flv|swf|pdf|mp3|mp4|xml|txt)$ {
    expires 30d;
}

# Pass the PHP scripts to FastCGI server listening on 127.0.0.1:9100
location ~ \.php$ {
    try_files $uri /index.php =404;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
    fastcgi_pass  127.0.0.1:9100;
}

你知道这哪里出了问题吗？

Answer 1

事实上确实事实上，您在 Windows 上运行 nginx。

它有一些严重的限制，其中最主要的是它使用select()用于连接处理，并且只在单个进程中运行单个线程。这意味着，虽然它在技术上可以accept()同时处理 1024 个连接，但它每次只能处理一个请求的实际工作。

就您而言，这意味着 Windows 绝对不适合作为开发平台。

如果您确实想继续运行 Windows，最好的选择是在 Linux 虚拟机中运行 nginx 服务器。您还应该考虑运行 Linux 工作站的优势。

Answer 2

*

它有一些 [严重的限制][1]，其中最主要的是它使用 [ select()][2] 进行连接处理，并且只在单个进程中运行单个线程。这意味着，虽然它在技术上可以 accept()同时处理 1024 个连接，但它每次只能处理一个请求。

*

如果你重复得足够多，你就会开始相信这些废话，select 是非阻塞的并且可以处理数百万个并发连接，这里的问题是 nginx 内部的阻塞脚本/模块/系统，它适用于所有操作系统，如果它阻塞它将阻塞整个工作程序直到完成，这需要使用 cosockets 重写。ea：http://forum.nginx.org/read.php?2,246165,246165#msg-246165

编辑 18.57：刚刚查看了配置，sendfile 关闭；首先，看起来您正在传递和获取来自 PHP 的数据，PHP 以这种方式一次只能处理一个请求，nginx 只是等待 php。如果您查看此答案下方的网站，请查看示例 conf，还要查看安装程序，它会为您生成一个 php 处理程序池，以便您可以处理更多并发请求。如果这全是关于 sql 的，那么请查看 ngxLuaDB，它有一个纯 Lua 中有效的非阻塞 sql 示例，为了提高速度，建议使用此方法。