Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Interface changes
+
+## Proposed interface changes for 1.10
+
+Status: To be discussed
+
+### Server interface
+
+#### mg\_start / mg\_init\_library
+
+Calling mg\_init\_library is recommended before calling mg\_start.
+
+Compatibility:
+Initially, mg\_init\_library will be called implicitly if it has 
+not been called before mg\_start.
+If mg\_init\_library was not called, mg\_stop may leave memory leaks.
+
+#### mg\_websocket\_write functions
+
+Calling mg\_lock\_connection is no longer called implicitly
+in mg\_websocket\_write functions. 
+If you use websocket write functions them from two threads,
+you must call mg\_lock\_connection explicitly, just like for any
+other connection.
+
+This is an API harmonization issue.
+
+Compatibility:
+If a websocket connection was used in only one thread, there is
+no incompatibility. If a websocket connection was used in multiple
+threads, the user has to add the mg\_lock\_connection before and
+the mg\_unlock\_connection after the websocket write call.
+
+#### open\_file member of mg\_callbacks
+
+This member is going to be removed.
+It is superseeded by mg\_add\_request\_handler.
+
+Compatibility:
+Current code using open\_file needs to be changed.
+Instructions how to do this will be provided.
+
+
+### Client interface
+
+
+#### mg\_init\_library
+
+Calling mg\_init\_library is required before calling any client
+function. In particular, the TLS initialization must be done
+before using mg\_connect\_client\_secure.
+
+Compatibility:
+Some parts of the client interface did not work, if mg\_start
+was not called before. Now server and client become independent.
+
+#### mg\_connect\_client (family)
+
+mg_connect_client needs several new parameters (options).
+
+Details are to be defined.
+
+mg_connect_client and mg_download should return a different kind of
+mg_connection than used in server callbacks. At least, there should
+be a function mg_get_response_info, instead of using 
+mg_get_request_info, and getting the HTTP response code from the
+server by looking into the uri member of struct mg_request_info.
+
+
+### `size_t` in all interface
+
+Having `size_t` in interfaces while building for 32 and 64 bit
+complicates maintenance in an unnecessary way 
+(see [498](https://github.com/civetweb/civetweb/issues/498)).
+
+Replace all data sizes by 64 bit integers.
+
+
+### Pattern definition
+
+The current definition of pattern matching is problematic
+(see [499](https://github.com/civetweb/civetweb/issues/499)).
+
+Find and implement a new definition.
+
+