Parser body_limit is optional (API Change):

API Changes:

The signature of basic_parser<>::body_limit(n) has changed. It now accepts an
optional std::uint64_t. The caller may indicate that no body limit is required
by calling body_limit(boost::none). The default limits remain in place in order
to maintain 'safe by default' behaviour.

closes #1897
closes #1965

include/boost/beast/http/basic_parser.hpp

@@ -69,8 +69,9 @@ template<bool isRequest>
 class basic_parser
     : private detail::basic_parser_base
 {
-    std::uint64_t body_limit_ =
-        default_body_limit(is_request{});   // max payload body
+    boost::optional<std::uint64_t>
+        body_limit_ =
+            default_body_limit(is_request{});   // max payload body
     std::uint64_t len_ = 0;                 // size of chunk or body
     std::uint64_t len0_ = 0;                // content length if known
     std::unique_ptr<char[]> buf_;           // temp storage
@@ -289,10 +290,11 @@ public:
 
         The default limit is 1MB for requests and 8MB for responses.
 
-        @param v The payload body limit to set
+        @param v An optional integral value representing the body limit.
+        If this is equal to `boost::none`, then the body limit is disabled.
     */
     void
-    body_limit(std::uint64_t v)
+    body_limit(boost::optional<std::uint64_t> v)
     {
         body_limit_ = v;
     }