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The /cmd path carried its own copy of the plain-text response header, which was the same string page_impl.c already keeps in HTTP_RESPONCE_TXT, minus one difference: the shared one never said Connection: close. This httpd closes after every response, so a reply that does not advertise it invites the browser to reuse the socket and lose the next request. HTTP_RESPONCE_JSON has always said so; the text one was the odd one out, and send_config() and send_cmd_log() were answering without it. The copy is gone and the shared string carries the header. The check for a command that printed nothing now compares against the length strtox() returned instead of sizeof() on the macro.