請求
NGINX ->[

{(post data) +> (NGX_HTTP_FASTCGI_STDIN)} * N +>

{(environment variables) +> (NGX_HTTP_FASTCGI_PARAMS)} * N +>

(角色和連接設置) +>

(NGX_HTTP_FASTCGI_BEGIN_REQUEST)

] -> fastCGI

NGX_HTTP_FASTCGI_BEGIN_REQUEST : 第一個發送出去的 ngx_http_fastcgi_header_t
角色和連接設置 : ngx_http_fastcgi_begin_request_t結構體
NGX_HTTP_FASTCGI_PARAMS : 環境變量 ,可能有N個
environment variables : 環境變量具體數據包括請求的url use_agent 等等,可能有N個,長度由NGX_HTTP_FASTCGI_PARAMS中的content_length_*指定
NGX_HTTP_FASTCGI_STDIN : 提交的數據 ,可能有N個,
post data : post 上來的數據,可能有N個,長度由NGX_HTTP_FASTCGI_STDIN中的content_length_*指定

數據結構

#define NGX_HTTP_FASTCGI_BEGIN_REQUEST  1
#define NGX_HTTP_FASTCGI_ABORT_REQUEST  2
#define NGX_HTTP_FASTCGI_END_REQUEST    3
#define NGX_HTTP_FASTCGI_PARAMS         4
#define NGX_HTTP_FASTCGI_STDIN          5
#define NGX_HTTP_FASTCGI_STDOUT         6
#define NGX_HTTP_FASTCGI_STDERR         7
#define NGX_HTTP_FASTCGI_DATA           8

typedef struct {
    u_char  version; //標識FastCGI協議版本 一般為 1
    u_char  type;  //參考上面的宏定義  NGX_HTTP_FASTCGI_*
    u_char  request_id_hi;  //請求id
    u_char  request_id_lo;
    u_char  content_length_hi; //請求內容長度
    u_char  content_length_lo;
    u_char  padding_length; //填充長度
    u_char  reserved;
} ngx_http_fastcgi_header_t;



typedef struct {
    u_char  role_hi; //角色id
    u_char  role_lo;
    u_char  flags; // 0 請求完畢後關閉連接 1 請求接收後保持連接
    u_char  reserved[5];
} ngx_http_fastcgi_begin_request_t;

fastCGI 接收請求樣例

		memcpy(&fh,recvBuf+0,sizeof(ngx_http_fastcgi_header_t));//FCGI_BEGIN_REQUEST
		memcpy(&fb,recvBuf+sizeof(ngx_http_fastcgi_header_t),sizeof(ngx_http_fastcgi_begin_request_t));
		memcpy(&fp,recvBuf+sizeof(ngx_http_fastcgi_header_t)+sizeof(ngx_http_fastcgi_begin_request_t),sizeof(ngx_http_fastcgi_header_t));//FCGI_PARAMS
		
		int paramLen = fp.contentLengthB1*256+fp.contentLengthB0; //816
		char paramBuf[1024];
		memcpy(paramBuf,recvBuf+sizeof(ngx_http_fastcgi_header_t)*2+sizeof(ngx_http_fastcgi_begin_request_t),paramLen);//environment variables
		
		memcpy(&fp,recvBuf+sizeof(ngx_http_fastcgi_header_t)*2+sizeof(ngx_http_fastcgi_begin_request_t)+paramLen,sizeof(ngx_http_fastcgi_header_t));//FCGI_PARAMS
		memcpy(&fp,recvBuf+sizeof(ngx_http_fastcgi_header_t)*3+sizeof(ngx_http_fastcgi_begin_request_t)+paramLen,sizeof(ngx_http_fastcgi_header_t));//FCGI_STDIN

響應

fastCGI ->[

(NGX_HTTP_FASTCGI_END_REQUEST) +>

{(response error data) +> (NGX_HTTP_FASTCGI_STDERR)} * N +>

{(response data) +> (NGX_HTTP_FASTCGI_STDOUT)} * N +>

] -> NGINX

NGX_HTTP_FASTCGI_STDOUT : 輸出的正常內容，可能有N個
response data : 相應的數據，長度由NGX_HTTP_FASTCGI_STDOUT中的content_length_*指
NGX_HTTP_FASTCGI_STDERR : 輸出的報錯內容，可能有N個
response error data : 相應的數據，長度由NGX_HTTP_FASTCGI_STDERR中的content_length_*指
NGX_HTTP_FASTCGI_END_REQUEST : 標識本次響應結束

fastCGI 接收樣例

		char sendBuf[1024];
		char response[]="HTTP/1.1 200 OK\r\nContent-Type:text/html\r\nContent-Length: 7\r\n\r\nWelcome";
		
		fStdout.version=1;
		fStdout.type=6;//FCGI_STDOUT
		fStdout.requestIdB1=0;
		fStdout.requestIdB0=1;
		
		fStdout.contentLengthB1=0;
		fStdout.contentLengthB0=strlen(response);
		fStdout.paddingLength=0;
		fStdout.reserved=0;
		
		fStderr=fStdout;
		fStderr.type=7;//FCGI_STDERR
		fStderr.contentLengthB0=0;

		fEnd = fStderr;
		fEnd.type=3;//FCGI_END_REQUEST
		
		memcpy(sendBuf,&fStdout,sizeof(ngx_http_fastcgi_header_t));
		memcpy(sendBuf+sizeof(ngx_http_fastcgi_header_t),response,strlen(response));
		memcpy(sendBuf+sizeof(ngx_http_fastcgi_header_t)+strlen(response),&fStderr,sizeof(ngx_http_fastcgi_header_t));
		memcpy(sendBuf+sizeof(ngx_http_fastcgi_header_t)*2+strlen(response),&fEnd,sizeof(ngx_http_fastcgi_header_t));

		send(sockConnection, sendBuf, sizeof(ngx_http_fastcgi_header_t)*3+strlen(response),0);

fastcgi協議解析(nginx)