Http RFC
http 1.0 http://www.faqs.org/rfcs/rfc1945.html
http 1.1 http://www.faqs.org/rfcs/rfc2616.html
Http Request
Common
Http Request Headers
<Request> <File-Path> <Http-Version>\r\n
<Host>\r\n
<Other-Http-Headers>\r\n
<Content-Length>\r\n
\r\n
<Contents>
Comments
<Request>
Can be 'GET' and 'POST', 'GET' means to download file, while 'POST' means to upload file.
<File-Path>
The file path to be downloaded or uploaded
<Http-Version>
Can be 'HTTP/1.0' or 'HTTP/1.1'
<Host>
Can be 'Host: <server>", here <server> is the host name of server, such as www.xxx.com
<Content-Length>
Can be 'Content-Length: <number>', <number> is the size of contents that will be sent to server
xxx
Http Response
Common Http Response Headers
<Http-Version> <Status-Code> <Reason-Phrase> \r\n
<Content-Encoding> \r\n
<Content-Length> \r\n
<Other-Headers> \r\n
\r\n
<Contents>
xxx
Samples
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <errno.h>
- #include <unistd.h>
- #include <netinet/in.h>
- #include <limits.h>
- #include <netdb.h>
- #include <arpa/inet.h>
- #include <ctype.h>
-
-
-
-
-
- char * Rstrchr(char * s, char x) {
- int i = strlen(s);
- if(!(*s)) return 0;
- while(s[i-1]) if(strchr(s + (i - 1), x)) return (s + (i - 1)); else i--;
- return 0;
- }
-
-
-
-
- void ToLowerCase(char * s) {
- while(s && *s) {*s=tolower(*s);s++;}
- }
-
-
-
-
- void GetHost(char * src, char * web, char * file, int * port) {
- char * pA;
- char * pB;
- memset(web, 0, sizeof(web));
- memset(file, 0, sizeof(file));
- *port = 0;
- if(!(*src)) return;
- pA = src;
- if(!strncmp(pA, "http://", strlen("http://"))) pA = src+strlen("http://");
- else if(!strncmp(pA, "https://", strlen("https://"))) pA = src+strlen("https://");
- pB = strchr(pA, '/');
- if(pB) {
- memcpy(web, pA, strlen(pA) - strlen(pB));
- if(pB+1) {
- memcpy(file, pB + 1, strlen(pB) - 1);
- file[strlen(pB) - 1] = 0;
- }
- }
- else memcpy(web, pA, strlen(pA));
- if(pB) web[strlen(pA) - strlen(pB)] = 0;
- else web[strlen(pA)] = 0;
- pA = strchr(web, ':');
- if(pA) *port = atoi(pA + 1);
- else *port = 80;
- }
-
-
- int main(int argc, char *argv[])
- {
- int sockfd;
- char buffer[1024];
- struct sockaddr_in server_addr;
- struct hostent *host;
- int portnumber,nbytes;
- char host_addr[256];
- char host_file[1024];
- char local_file[256];
- FILE * fp;
- char request[1024];
- int send, totalsend;
- int i;
- char * pt;
-
- if(argc!=2)
- {
- fprintf(stderr,"Usage:%s web-address\a\n",argv[0]);
- exit(1);
- }
- printf("parameter.1 is: %s\n", argv[1]);
- ToLowerCase(argv[1]);
- printf("lowercase parameter.1 is: %s\n", argv[1]);
-
- GetHost(argv[1], host_addr, host_file, &portnumber);
- printf("webhost:%s\n", host_addr);
- printf("hostfile:%s\n", host_file);
- printf("portnumber:%d\n\n", portnumber);
-
- if((host=gethostbyname(host_addr))==NULL)
- {
- fprintf(stderr,"Gethostname error, %s\n", strerror(errno));
- exit(1);
- }
-
-
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
- {
- fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
- exit(1);
- }
-
-
- bzero(&server_addr,sizeof(server_addr));
- server_addr.sin_family=AF_INET;
- server_addr.sin_port=htons(portnumber);
- server_addr.sin_addr=*((struct in_addr *)host->h_addr);
-
-
- if(connect(sockfd,(struct sockaddr *)(&server_addr)
- ,sizeof(struct sockaddr))==-1)
- {
- fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
- exit(1);
- }
-
- sprintf(request, "GET /%s HTTP/1.1\r\nAccept: *
-
-
-
-
-
- if(host_file && *host_file) pt = Rstrchr(host_file, '/');
- else pt = 0;
-
- memset(local_file, 0, sizeof(local_file));
- if(pt && *pt) {
- if((pt + 1) && *(pt+1)) strcpy(local_file, pt + 1);
- else memcpy(local_file, host_file, strlen(host_file) - 1);
- }
- else if(host_file && *host_file) strcpy(local_file, host_file);
- else strcpy(local_file, "index.html");
- printf("local filename to write:%s\n\n", local_file);
-
-
- send = 0;totalsend = 0;
- nbytes=strlen(request);
- while(totalsend < nbytes) {
- send = write(sockfd, request + totalsend, nbytes - totalsend);
- if(send==-1) {printf("send error!%s\n", strerror(errno));exit(0);}
- totalsend+=send;
- printf("%d bytes send OK!\n", totalsend);
- }
-
- fp = fopen(local_file, "a");
- if(!fp) {
- printf("create file error! %s\n", strerror(errno));
- return 0;
- }
- printf("\nThe following is the response header:\n");
- i=0;
-
- while((nbytes=read(sockfd,buffer,1))==1)
- {
- if(i < 4) {
- if(buffer[0] == '\r' || buffer[0] == '\n') i++;
- else i = 0;
- printf("%c", buffer[0]);
- }
- else {
- fwrite(buffer, 1, 1, fp);
- i++;
- if(i%1024 == 0) fflush(fp);
- }
- }
- fclose(fp);
-
- close(sockfd);
- exit(0);
- }
zj@zj:~/C_pram/practice/http_client$ ls
httpclient httpclient.c
zj@zj:~/C_pram/practice/http_client$ ./httpclient http://www.baidu.com/
parameter.1 is: http://www.baidu.com/
lowercase parameter.1 is: http://www.baidu.com/
webhost:www.baidu.com
hostfile:
portnumber:80
GET / HTTP/1.1
Accept: *
原文地址 http://blog.chinaunix.net/u2/76292/showart_1353805.html
(websurf) |