nginx access_log 显示访问 200，但是页面空白

域名：zengzhang.in，下面一个 wordpress 程序
nginx 配置如下：

server {
    listen       80;
    server_name  zengzheng.in;
    error_log /var/log/nginx/binge-error.log;
    access_log /var/log/nginx/binge-access.log;
    root   /var/www/zengzhang.in/;
    index index.php index.html index.htm;

    location / {
        try_files $uri $uri/ =404;
    }
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/www;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

部分访问日志如下：

115.231.100.106 - - [12/Jun/2015:08:21:01 -0400] "GET / HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36"
115.231.100.106 - - [12/Jun/2015:08:21:02 -0400] "GET /favicon.ico HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36"
101.226.73.30 - - [12/Jun/2015:08:21:31 -0400] "GET / HTTP/1.1" 200 31 "-" "DNSPod-Monitor/2.0"
115.231.100.106 - - [12/Jun/2015:08:22:27 -0400] "GET / HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36"
115.231.100.106 - - [12/Jun/2015:08:22:28 -0400] "GET /favicon.ico HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36"

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刚刚遇到了同样的问题，已经解决。
我注意到你的配置文件里面有两个root，第二个location块中有一个$document_root$fastcgi_script_name;此处的$document_root的值可能不是你期望的/var/www/zengzhang.in/，换成这个值试试看。就是把第二个location中的$document_root$fastcgi_script_name换成/var/www/zengzhang.in/$fastcgi_script_name

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1、请先检查你的index.php有没有问题，也许你关闭了所有错误输出，这是php解析出问题就导致空白页。

2、你的try_files好像和我的不太一样，我的是这样样子，一直正常工作好几年了

try_files $uri $uri/ /index.php?q=$uri&$args;