case-insensitive http responses

AddressBook.cpp

@@ -558,6 +558,7 @@ namespace client
 						if (colon != std::string::npos)
 						{
 							std::string field = header.substr (0, colon);
+							boost::to_lower (field); // field are not case-sensitive
 							colon++;
 							header.resize (header.length () - 1); // delete \r	
 							if (field == i2p::util::http::ETAG)
@@ -567,9 +568,8 @@ namespace client
 							else if (field == i2p::util::http::TRANSFER_ENCODING)
 								isChunked = !header.compare (colon + 1, std::string::npos, "chunked");
 							else if (field == i2p::util::http::CONTENT_ENCODING)
-								isGzip = !header.compare (colon + 1, std::string::npos, "gzip");
+								isGzip = !header.compare (colon + 1, std::string::npos, "gzip") ||
-							else if (field == i2p::util::http::CONTENT_ENCODING1) // Content-encoding
+									!header.compare (colon + 1, std::string::npos, "x-i2p-gzip");
-								isGzip = !header.compare (colon + 1, std::string::npos, "x-i2p-gzip");
 						}	
 					}
 					LogPrint (eLogInfo, "Addressbook: ", m_Link, " ETag: ", m_Etag, " Last-Modified: ", m_LastModified);

util.cpp

@@ -212,6 +212,7 @@ namespace http
 				if (colon != std::string::npos)
 				{
 					std::string field = header.substr (0, colon);
+					boost::to_lower (field);
 					if (field == i2p::util::http::TRANSFER_ENCODING)
 						isChunked = (header.find ("chunked", colon + 1) != std::string::npos);
 				}	

util.h

@@ -29,14 +29,15 @@ namespace util
 
 	namespace http
 	{
-		const char ETAG[] = "ETag";
+		// in (lower case)
+		const char ETAG[] = "etag"; // ETag
+		const char LAST_MODIFIED[] = "last-modified"; // Last-Modified
+		const char TRANSFER_ENCODING[] = "transfer-encoding"; // Transfer-Encoding
+		const char CONTENT_ENCODING[] = "content-encoding"; // Content-Encoding
+		// out
 		const char IF_NONE_MATCH[] = "If-None-Match";
-		const char IF_MODIFIED_SINCE[] = "If-Modified-Since";
+		const char IF_MODIFIED_SINCE[] = "If-Modified-Since";	
-		const char LAST_MODIFIED[] = "Last-Modified";
+	
-		const char TRANSFER_ENCODING[] = "Transfer-Encoding";
-		const char CONTENT_ENCODING[] = "Content-Encoding";
-		const char CONTENT_ENCODING1[] = "Content-encoding";
-		
 		std::string GetHttpContent (std::istream& response);
 		void MergeChunkedResponse (std::istream& response, std::ostream& merged);
 		std::string urlDecode(const std::string& data);