nginx 500内部服务器错误

当我访问127.0.0.1:6789它工作正常，但是当我尝试访问像127.0.0.1:6789/busca.html?q=a，我有500内部服务器错误

这是我的nginxconfiguration文件

server { listen 88; root /vagrant/rizqcursosonline/rizqcursosonline/frontend/wwwpublic; index index.php index.html index.htm; server_name example.com; location / { try_files $uri $uri/ /index.html; } error_page 404 /404.html; error_page 500 502 503 504 /50x.html; location = /50x.html { root /vagrant/rizqcursosonline/rizqcursosonline/frontend/wwwpublic/; } # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 location ~ \.php$ { 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; } } 

nginx日志错误

 2014/04/12 18:16:32 [error] 4165#0: *5 rewrite or internal redirection cycle while internally redirecting to "/index.html", client: 10.0.2.2, server: example.com, request: "GET /busca.html?q=a HTTP/1.1", host: "127.0.0.1:6789", referrer: "http://127.0.0.1:6789/" 

2014/04/12 18:16:32 [error] 4165＃0：* 7重写或内部redirect周期内部redirect到“/index.html”，客户端：10.0.2.2，服务器：example.com，请求：“ GET /favicon.ico HTTP / 1.1“，主机：”127.0.0.1:6789“

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 try_files $uri $uri/ /index.html; 

 try_files $uri/ $uri /index.php?$query_string;