The design of high concurrent server: the design of fastcgi

To use FASTCGI in server development, the following methods are used:

while (fcgi_accept () >= 0) {  
                printf ("Content-type:text/plain \ r \ n"
                "Content-length:%d\r\n" "
                Connection:close\r\n\r\n%s\r\n ", strlen (buffer), buffer);  
        

The facgcgi header file has the following macros:

#undef  fprintf  
#define fprintf  fcgi_fprintf  
#undef  printf  
#define printf   fcgi_ Printf

As you can see, the printf function has been macro-turned, and printf in the program is no longer standard output. So there is a problem, if you want to debug print information to stdout, it is not.

Real-world development, there may be a variety of problems, and sometimes do need to print some information, this time you can modify the Fcgi_stdio.h header file, changed to the following:

#undef  _fprintf  
#define _FPRINTF  fcgi_fprintf  
#undef  _printf  
#define _PRINTF   fcgi_printf

Also change the corresponding macros in the appropriate place in the program.

FastCGI parsing can be done through this function:

Char *getenv (const char *name)

There are several types of parameters:

Content_Type

Content_Type	GET request Type
Content_length	Length of body section
Query_string	Request string

Take the following HTTP request message as an example:

Get/s?

ie=utf-8&bs=%e8%bf%99%e6%98%af&f=8&rsv_bp=1&rsv_spt=3&wd=%e6%9c%8d%

E5%8A%A1%E5%99%A8% e5%bc%80%e5%8f%

91&rsv_sug3=11&rsv_sug=0&rsv_sug4=609&rsv_sug1=2&inputt=32681 HTTP/1.1 

 
Host:www.baidu.com  
Connection:keep-alive  
content-type:text/html;charset=utf-8  
accept:text/html,application/xhtml+xml, application/xml;q=0.9,*/*;q=0.8  
user-agent:mozilla/5.0 (Windows NT 6.1; WOW64) applewebkit/537.31 (khtml, like Gecko) 

chrome/26.0.1410.64 safari/537.31  
www.baidu.com/s?wd=%E8%BF%99%E6%98%

af&rsv_bp=0&ch=&tn=baidu&bar=&rsv_spt=3&ie= utf-

8&rsv_sug3=4&rsv_sug=0&rsv_sug4=240&rsv_sug1=3&inputt=2835  
Accept-Encoding: GZIP,DEFLATE,SDCH  
accept-language:zh-cn,zh;q=0.8  
accept-charset:gbk,utf-8;q=0.7,*;q=0.3  
Cookies: baiduid=a83324e58ae26486e46fc49ed127891b:fg=1; bdsvrtm=163; 

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