3D Mobile API Schema Compatibility Simulator

Compatibility Shim

Server schema version

Server on v5

Schema change per layer

Client request rate 1.2 req/s

Requests sent

Success rate

–

Shimmed OK

Hard failures

How it works

Each API schema version is drawn as a stacked platform, v1 at the bottom rising to v5 at the top where the live server sits. A request spawned on a client's home platform must climb through every version boundary above it to reach the server. An additive boundary is a plain gap — the packet floats straight through. A breaking boundary is rendered as a glowing adapter ring: with the shim on, the packet passes through the ring and gets recoloured (shimmed), paying a brief pause; with the shim off, the packet cannot cross the ring at all and is destroyed on contact.

for layer in client.version..server.version:
  if layer.breaking and !shimActive: reject
  if layer.breaking and shimActive: pause, recolor
  else: pass through

Shim toggle — turn the adapter rings from walls into gates.
Server schema version — raises or lowers how many platforms a request must climb.
Layer type buttons — flip any boundary between additive and breaking; the ring's colour and behaviour update immediately.
Client request rate — orbit the scene while requests keep climbing to watch a single client's packets stack up.

Real-world relevance: this vertical stack is the same mental model backend teams use for API gateway adapter chains — each breaking change adds a translation layer that every older client's traffic must still pass through, forever, until that client finally upgrades.

Client platform Request OK Shimmed OK Failed

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