Always attempt a persistent connection unless http1.0 or !shouldAttemptPersisten…

…tConnection or we get a connection:close header
Stop relying on receiving a keep-alive header for persistent connections

@@ -21,7 +21,7 @@
 #import "ASIInputStream.h"
 
 // Automatically set on build
-NSString *ASIHTTPRequestVersion = @"v1.5-46 2010-02-24";
+NSString *ASIHTTPRequestVersion = @"v1.5-47 2010-02-24";
 
 NSString* const NetworkRequestErrorDomain = @"ASIHTTPRequestErrorDomain";
 
@@ -1619,11 +1619,11 @@ static BOOL isiPhoneOS2;
 {
 	[self setAuthenticationNeeded:ASINoAuthenticationNeededYet];
 
-	CFHTTPMessageRef headers = (CFHTTPMessageRef)CFReadStreamCopyProperty((CFReadStreamRef)[self readStream], kCFStreamPropertyHTTPResponseHeader);
-	if (!headers) {
+	CFHTTPMessageRef message = (CFHTTPMessageRef)CFReadStreamCopyProperty((CFReadStreamRef)[self readStream], kCFStreamPropertyHTTPResponseHeader);
+	if (!message) {
 		return;
 	}
-	if (CFHTTPMessageIsHeaderComplete(headers)) {
+	if (CFHTTPMessageIsHeaderComplete(message)) {
 
 #if DEBUG_REQUEST_STATUS
 		if ([self totalBytesSent] == [self postLength]) {
@@ -1631,12 +1631,12 @@ static BOOL isiPhoneOS2;
 		}
 #endif		
 
-		CFDictionaryRef headerFields = CFHTTPMessageCopyAllHeaderFields(headers);
+		CFDictionaryRef headerFields = CFHTTPMessageCopyAllHeaderFields(message);
 		[self setResponseHeaders:(NSDictionary *)headerFields];
 
 		CFRelease(headerFields);
-		[self setResponseStatusCode:CFHTTPMessageGetResponseStatusCode(headers)];
-		[self setResponseStatusMessage:[(NSString *)CFHTTPMessageCopyResponseStatusLine(headers) autorelease]];
+		[self setResponseStatusCode:CFHTTPMessageGetResponseStatusCode(message)];
+		[self setResponseStatusMessage:[(NSString *)CFHTTPMessageCopyResponseStatusLine(message) autorelease]];
 
 		// Is the server response a challenge for credentials?
 		if ([self responseStatusCode] == 401) {
@@ -1773,8 +1773,17 @@ static BOOL isiPhoneOS2;
 		}
 		
 		// Handle connection persistence
-		if ([self shouldAttemptPersistentConnection] && [[[self responseHeaders] objectForKey:@"Connection"] isEqualToString:@"Keep-Alive"]) {
+		NSString *httpVersion = [(NSString *)CFHTTPMessageCopyVersion(message) autorelease];
+		
+		// We won't re-use this connection if this request is set to use HTTP 1.0, or the server is talking in HTTP 1.0, or persistent connections are turned off for this request
+		if (![self useHTTPVersionOne] && [self shouldAttemptPersistentConnection] && ![httpVersion isEqualToString:(NSString *)kCFHTTPVersion1_0]) {
+
+			// See if server explicitly told us to close the connection
+			if (![[[[self responseHeaders] objectForKey:@"Connection"] lowercaseString] isEqualToString:@"close"]) {
+				
 				NSString *keepAliveHeader = [[self responseHeaders] objectForKey:@"Keep-Alive"];
+				
+				// If we got a keep alive header, we'll reuse the connection for as long as the server tells us
 				if (keepAliveHeader) { 
 					int timeout = 0;
 					int max = 0;
@@ -1788,13 +1797,19 @@ static BOOL isiPhoneOS2;
 						[self setCanUsePersistentConnection:YES];
 						closeStreamTime = timeout;
 					}
+				
+				// Otherwise, we'll assume we can keep this connection open
+				} else {
+					[self setCanUsePersistentConnection:YES];
+					closeStreamTime = 60; 
+				}
 			}
 		}
 	}
 
 	
 	
-	CFRelease(headers);
+	CFRelease(message);
 }
 
 #pragma mark http authentication