<h4 id="Expression_switches">Expression switches</h4>

<p>
In an expression switch,
the switch expression is evaluated and
the case expressions, which need not be constants,
are evaluated left-to-right and top-to-bottom; the first one that equals the
switch expression
triggers execution of the statements of the associated case;
the other cases are skipped.
If no case matches and there is a "default" case,

The sequence of execution before FastAPI 0.106.0 was like this diagram:

Time flows from top to bottom. And each column is one of the parts interacting or executing code.

```mermaid
sequenceDiagram

participant client as Client
participant handler as Exception handler
participant dep as Dep with yield

  <mime-type type="application/x-font-otf">
    <alias type="application/vnd.ms-opentype"/>
    <acronym>OTF</acronym>
    <_comment>OpenType Font</_comment>
    <magic priority="40">
      <match value="OTTO\x00" type="string" offset="0"/>
    </magic>
    <glob pattern="*.otf"/>
  </mime-type>

  <mime-type type="application/x-font-pcf">
    <glob pattern="*.pcf"/>
  </mime-type>