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Microbursts in the datacenter network (DCN) last for an extremely short time in switches and are difficult to discover from a coarse-grained perspective. Most prior works are dedicated to in-network detection of microbursts and have not yet attempted to mitigate them in real time. Therefore, a realtime microburst mitigator, called RIMM, is proposed in this work and mainly applies <bold>orderly detours</bold> with <bold>flowlet intervals</bold> for preventing packet loss and packet retransmission in the network. RIMM mainly consists of three key components: (1) detour launcher, (2) packet sequencer, and (3) post-detour handler, and can entirely work in-network on a programmable switch. Experimental results demonstrate that RIMM is capable of preventing packet loss, allowing the reduction of packet retransmissions, while effectively reducing microbursts, resulting in an enhanced data-center network performance.