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copied!<p>Using BSD sockets or, if you're somewhat limited, say you have some RTOS, some simpler TCP stack, like lwIP, you can form the GET/POST request.</p> <p>There are a number of open-source implementations. See the "happyhttp" as a sample ( <a href="http://scumways.com/happyhttp/happyhttp.html" rel="noreferrer">http://scumways.com/happyhttp/happyhttp.html</a> ). I know, it is C++, not C, but the only thing that is "C++-dependant" there is a string/array management, so it is easily ported to pure C.</p> <p>Beware, there are no "packets", since HTTP is usually transfered over the TCP connection, so technically there is only a stream of symbols in RFC format. Since http requests are usually done in a connect-send-disconnect manner, one might actually call this a "packet".</p> <p>Basically, once you have an open socket (sockfd) "all" you have to do is something like</p> <pre><code>char sendline[MAXLINE + 1], recvline[MAXLINE + 1]; char* ptr; size_t n; /// Form request snprintf(sendline, MAXSUB, "GET %s HTTP/1.0\r\n" // POST or GET, both tested and works. Both HTTP 1.0 HTTP 1.1 works, but sometimes "Host: %s\r\n" // but sometimes HTTP 1.0 works better in localhost type "Content-type: application/x-www-form-urlencoded\r\n" "Content-length: %d\r\n\r\n" "%s\r\n", page, host, (unsigned int)strlen(poststr), poststr); /// Write the request if (write(sockfd, sendline, strlen(sendline))>= 0) { /// Read the response while ((n = read(sockfd, recvline, MAXLINE)) > 0) { recvline[n] = '\0'; if(fputs(recvline,stdout) == EOF) { cout << ("fputs erros"); } /// Remove the trailing chars ptr = strstr(recvline, "\r\n\r\n"); // check len for OutResponse here ? snprintf(OutResponse, MAXRESPONSE,"%s", ptr); } } </code></pre>

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