Figure 6-1. How Dapr service invocation works.

On figure 6-1 the two call 1 and 3 cannot both call on localhost:3500, if Service A sidecar runs on port 3500 then Service B cannot run on port 3500.

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* Content: [The Dapr service invocation building block](https://docs.microsoft.com/en-us/dotnet/architecture/dapr-for-net-developers/service-invocation#feedback)
* Content Source: [docs/architecture/dapr-for-net-developers/service-invocation.md](https://github.com/dotnet/docs/blob/main/docs/architecture/dapr-for-net-developers/service-invocation.md)
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