message: Use lower case.
diff: @@ -703,7 +703,7 @@ int swPort_http_static_handler(swHttpRequest *request, swConnection *conn)
  {
  response.length = response.info.len = snprintf(header_buffer, sizeof(header_buffer),
  "HTTP/1.1 304 Not Modified\r\n"
  - "Connection: Keep-Alive\r\n"
  + "Connection: keep-alive\r\n"
  "Date: %s\r\n"
  "Last-Modified: %s\r\n"
  "Server: %s\r\n\r\n", date_, date_last_modified,
  @@ -716,7 +716,7 @@ int swPort_http_static_handler(swHttpRequest *request, swConnection *conn)
  response.length = response.info.len = snprintf(header_buffer, sizeof(header_buffer),
  "HTTP/1.1 200 OK\r\n"
  - "Connection: Keep-Alive\r\n"
  + "Connection: keep-alive\r\n"
  "Content-Length: %ld\r\n"
  "Content-Type: %s\r\n"
  "Date: %s\r\n"
  