Add SetPostBuffer(wxMemoryBuffer) and SetPostText() to wxHTTP.

This allows to post binary data or text data in e.g. UTF-8 encoding (which is
by far the most common case) easily.

Deprecate the existing SetPostBuffer(wxString) as it didn't explicitly specify
the encoding to use for the data to be posted.

Closes #13870.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70408 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/protocol/http.h

@@ -17,6 +17,7 @@
 
 #include "wx/hashmap.h"
 #include "wx/protocol/protocol.h"
+#include "wx/buffer.h"
 
 class WXDLLIMPEXP_NET wxHTTP : public wxProtocol
 {
@@ -36,13 +37,19 @@ public:
     int GetResponse() const { return m_http_response; }
 
     void SetHeader(const wxString& header, const wxString& h_data);
-    void SetPostBuffer(const wxString& post_buf);
+    bool SetPostText(const wxString& contentType,
+                     const wxString& data,
+                     const wxMBConv& conv = wxConvUTF8);
+    bool SetPostBuffer(const wxString& contentType, const wxMemoryBuffer& data);
     void SetProxyMode(bool on);
 
     /* Cookies */
     wxString GetCookie(const wxString& cookie) const;
     bool HasCookies() const { return m_cookies.size() > 0; }
 
+    // Use the other SetPostBuffer() overload or SetPostText() instead.
+    wxDEPRECATED(void SetPostBuffer(const wxString& post_buf));
+
 protected:
     enum wxHTTP_Req
     {
@@ -80,7 +87,8 @@ protected:
     bool m_read,
          m_proxy_mode;
     wxSockAddress *m_addr;
-    wxString m_post_buf;
+    wxMemoryBuffer m_postBuffer;
+    wxString       m_contentType;
     int m_http_response;
 
     DECLARE_DYNAMIC_CLASS(wxHTTP)