HTTP delete method access denied

RouterOS Beginner Basics
1

I have configured mikrotik router 750GL with broad band connection. I tried access delete method of any site but I get access denied as result, If I try same delete method through other router then I can able to access the site(I get some response but not like access denied). I used chrome’s postman extension to test delete method is working or not through mikrotik router. The error I’m getting in postman is

<HTML>
    <HEAD>
        <TITLE>Access Denied</TITLE>
    </HEAD>
    <BODY BGCOLOR="white" FGCOLOR="black">
        <H1>Access Denied</H1>
        <HR>
            <FONT FACE="Helvetica,Arial">
                <B>
Description: You are not allowed to access the document you requested.
</B>
            </FONT>
            <HR>
            </BODY>

All methods are working except delete and purge methods. I tried disable all rules in firewall but still same problem. Is this mikrotik router’s default behavior? If so have can I overcome this?

EDIT:

The problem is with Static IP. We have other broadband connection which is PPPoE connection there I have dynamic IP assigned and there delete method is working, I tried this test like connected PPPoE connection with mikrotik router then delete method is working. But when I tried connect Static IP connection back to mikrotik router then delete method is not working. NOTE: Both broadband(static IP and PPPoE) service provider is same.