feat: set_version

Author: vinniefalco

include/boost/http_proto/response_base.hpp

@@ -129,6 +129,23 @@ class response_base
                 obsolete_reason(sc), v);
     }
 
+    /** Set the HTTP version of the response
+
+        @par Exception Safety
+        Strong guarantee.
+        Calls to allocate may throw.
+        Exception thrown if maximum capacity exceeded.
+
+        @throw std::length_error
+        Maximum capacity would be exceeded.
+
+        @param v The version to set.
+    */
+    BOOST_HTTP_PROTO_DECL
+    void
+    set_version(
+        http_proto::version v);
+
     /** Set the status code of the response.
 
         The reason-phrase will be set to the

src/response_base.cpp

@@ -57,5 +57,37 @@ set_start_line_impl(
     h_.on_start_line();
 }
 
+void
+response_base::
+set_version(
+    http_proto::version v)
+{
+    if(v == h_.version)
+        return;
+    if(h_.is_default())
+    {
+        auto def = h_.get_default(detail::kind::response);
+        return set_start_line_impl(
+            def->res.status, def->res.status_int,
+            core::string_view(
+                def->cbuf + 13, def->prefix - 15), v);
+    }
+
+    // Introduce a new scope so that prefix_op's
+    // destructor runs before h_.on_start_line().
+    {
+        auto op = prefix_op_t(
+            *this, h_.prefix, nullptr);
+        char* dest = h_.buf;
+        if(v == version::http_1_1)
+            dest[7] = '1';
+        else
+            dest[7] = '0';
+        h_.version = v;
+    }
+
+    h_.on_start_line();
+}
+
 } // http_proto
 } // boost

test/unit/response.cpp

@@ -284,6 +284,20 @@ class response_test
             }
         }
 
+        // set_version
+        {
+            response res;
+            res.set_version(version::http_1_1);
+            BOOST_TEST_EQ(res.buffer(),
+                "HTTP/1.1 200 OK\r\n\r\n");
+            res.set_version(version::http_1_0);
+            BOOST_TEST_EQ(res.buffer(),
+                "HTTP/1.0 200 OK\r\n\r\n");
+            res.set_version(version::http_1_1);
+            BOOST_TEST_EQ(res.buffer(),
+                "HTTP/1.1 200 OK\r\n\r\n");
+        }
+
         // set_status
         {
             response res;