diff --git a/test/net/http/utils.rb b/test/net/http/utils.rb
index b9b289d..44a61c9 100644
--- a/test/net/http/utils.rb
+++ b/test/net/http/utils.rb
@@ -150,13 +150,27 @@ def parse_path_and_query(path)
       def read_body
         content_length = @headers['Content-Length']&.to_i
         return unless content_length && content_length > 0
-        @socket.read(content_length)
+
+        body = ""
+        while body.bytesize < content_length
+          chunk = @socket.read(content_length - body.bytesize)
+          break unless chunk
+          body << chunk
+        end
+
+        body
       end
 
       def read_chunked_body
         body = ""
         while (chunk_size = @socket.gets.strip.to_i(16)) > 0
-          body << @socket.read(chunk_size)
+          chunk = ""
+          while chunk.bytesize < chunk_size
+            part = @socket.read(chunk_size - chunk.bytesize)
+            break unless part
+            chunk << part
+          end
+          body << chunk
           @socket.read(2) # read \r\n after each chunk
         end
         body
@@ -304,7 +318,15 @@ def handle_get(path, headers, socket)
   end
 
   def handle_post(path, headers, socket)
-    body = socket.read(headers['Content-Length'].to_i)
+    buffer_size = 1024
+    remaining_size ||= headers['Content-Length'].to_i
+    body = ""
+    while remaining_size > 0
+      sz = [buffer_size, remaining_size].min
+      break unless buf = socket.read(sz)
+      remaining_size -= buf.bytesize
+      body << buf
+    end
     scheme = headers['X-Request-Scheme'] || 'http'
     host = @config['host']
     port = socket.addr[1]