Fix stupid regression that broke download progress

You can never have enough tests! :)

@@ -21,7 +21,7 @@
 #import "ASIInputStream.h"
 
 // Automatically set on build
-NSString *ASIHTTPRequestVersion = @"v1.2-72 2010-01-06";
+NSString *ASIHTTPRequestVersion = @"v1.5-1 2010-01-08";
 
 NSString* const NetworkRequestErrorDomain = @"ASIHTTPRequestErrorDomain";
 
@@ -2367,6 +2367,10 @@ static BOOL isiPhoneOS2;
 
 - (void)handleBytesAvailable
 {
+	if (![self responseHeaders]) {
+		[self readResponseHeaders];
+	}
+	
 	// In certain (presumably very rare) circumstances, handleBytesAvailable seems to be called when there isn't actually any data available
 	// We'll check that there is actually data available to prevent blocking on CFReadStreamRead()
 	// So far, I've only seen this in the stress tests, so it might never happen in real-world situations.

@@ -446,6 +446,21 @@
 
 	BOOL success = (progress == 1.0);
 	GHAssertTrue(success,@"Failed to properly increment download progress %f != 1.0",progress);	
+	
+	progress = 0;
+	request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://allseeing-i.com/ASIHTTPRequest/tests/the_great_american_novel.txt"]];
+	[request setDownloadProgressDelegate:self];
+	[request startAsynchronous];
+	
+	[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:2]];
+	
+	success = (progress != 1.0);
+	GHAssertTrue(success,@"Downloaded too quickly, cannot proceed with test");	
+	 
+	success = (progress > 0);
+	GHAssertTrue(success,@"Either downloaded too slowly, or progress is not being correctly updated");		 
+	
+	
 }
 
 - (void)testUploadProgress