refine http code, define CRLF consts for http

@@ -26,6 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #ifdef SRS_HTTP_CALLBACK
 
 #include <sstream>
+using namespace std;
 
 #include <stdlib.h>
 #include <sys/socket.h>
@@ -37,6 +38,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_kernel_log.hpp>
 #include <srs_app_socket.hpp>
 
+using namespace srs;
+
 #define SRS_DEFAULT_HTTP_PORT 80
 #define SRS_HTTP_RESPONSE_OK "0"
 
@@ -150,13 +153,13 @@ int SrsHttpClient::post(SrsHttpUri* uri, std::string req, std::string& res)
     // POST %s HTTP/1.1\r\nHost: %s\r\nContent-Length: %d\r\n\r\n%s
     std::stringstream ss;
     ss << "POST " << uri->get_path() << " "
-        << "HTTP/1.1\r\n"
-        << "Host: " << uri->get_host() << "\r\n"
-        << "Connection: Keep-Alive" << "\r\n"
-        << "Content-Length: " << std::dec << req.length() << "\r\n"
-        << "User-Agent: " << RTMP_SIG_SRS_NAME << RTMP_SIG_SRS_VERSION << "\r\n"
-        << "Content-Type: text/html" << "\r\n"
-        << "\r\n"
+        << "HTTP/1.1" << CRLF
+        << "Host: " << uri->get_host() << CRLF
+        << "Connection: Keep-Alive" << CRLF
+        << "Content-Length: " << std::dec << req.length() << CRLF
+        << "User-Agent: " << RTMP_SIG_SRS_NAME << RTMP_SIG_SRS_VERSION << CRLF
+        << "Content-Type: text/html" << CRLF
+        << CRLF
         << req;
     
     SrsSocket skt(stfd);

@@ -31,6 +31,24 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_app_st.hpp>
 
+// http specification
+namespace srs
+{
+    // CR             = <US-ASCII CR, carriage return (13)>
+    const static char CR = '\r';
+    // LF             = <US-ASCII LF, linefeed (10)>
+    const static char LF = '\n';
+    // SP             = <US-ASCII SP, space (32)>
+    const static char SP = ' ';
+    // HT             = <US-ASCII HT, horizontal-tab (9)>
+    const static char HT = 9;
+    
+    // HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all
+    // protocol elements except the entity-body (see appendix 19.3 for
+    // tolerant applications). 
+    const static char* CRLF = "\r\n";
+};
+
 #ifdef SRS_HTTP_CALLBACK
 
 class SrsRequest;

@@ -31,11 +31,11 @@ SrsHttpApi::SrsHttpApi(SrsServer* srs_server, st_netfd_t client_stfd)
 {
 }
 
-SrsHttpApi::~SrsHttpApi() 
+SrsHttpApi::~SrsHttpApi()
 {
 }
 
-int SrsHttpApi::do_cycle() 
+int SrsHttpApi::do_cycle()
 {
     int ret = ERROR_SUCCESS;