NetServices: Add skeleton BHttpSession class and its documentation

Change-Id: Ia8a35588422908f6fe9b839ce239fb478baf298b

headers/private/netservices2/NetServicesDefs.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2021 Haiku Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#ifndef _NETSERVICES_DEFS_H_
+#define _NETSERVICES_DEFS_H_
+
+
+#include <ErrorsExt.h>
+#include <StringList.h>
+#include <Url.h>
+
+
+namespace BPrivate {
+
+namespace Network {
+
+
+// Standard exceptions
+class BUnsupportedProtocol : public BError {
+public:
+							BUnsupportedProtocol(const char* origin, BUrl url,
+								BStringList supportedProtocols);
+							BUnsupportedProtocol(BString origin, BUrl url,
+								BStringList supportedProtocols);
+
+	virtual	const char*		Message() const noexcept override;
+
+	const	BUrl&			Url() const;
+	const	BStringList&	SupportedProtocols() const;
+
+private:
+			BUrl			fUrl;
+			BStringList		fSupportedProtocols;
+};
+
+
+class BInvalidUrl : public BError {
+public:
+							BInvalidUrl(const char* origin, BUrl url);
+							BInvalidUrl(BString origin, BUrl url);
+
+	virtual	const char*		Message() const noexcept override;
+
+	const	BUrl&			Url() const;
+
+private:
+			BUrl			fUrl;
+};
+
+
+}
+
+}
+
+#endif