en keyword">public</span> <span class="token class-name">Mono</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ResponseEntity</span><span class="token punctuation">&lt;</span><span class="token class-name">SecurityConfiguration</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> <span class="token function">securityConfiguration</span><span class="token punctuation">(</span><span class="token punctuat