Parser callbacks may not throw (API Change)

CHANGELOG.md

@@ -4,6 +4,7 @@
 * Tidy up some declarations
 * Fix basic_streambuf::capacity
 * Add basic_streambuf::alloc_size
+* Parser callbacks may not throw
 
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include/beast/http/basic_parser_v1.hpp

@@ -141,8 +141,9 @@ static std::uint64_t constexpr no_content_length =
     "callbacks" from here on) matching a specific signature.
 
     Callbacks are detected through SFINAE. The derived class may
-    implement as few or as many of the members as needed.
-    These are the signatures of the callbacks:<br>
+    implement as few or as many of the members as needed. Callbacks
+    may not throw exceptions. These are the signatures of the
+    callbacks:<br>
 
     @li `void on_start(error_code&)`