///

## Returning a custom `Response`

The example above shows all the parts you need, but it's not very useful yet, as you could have just returned the `item` directly, and **FastAPI** would put it in a `JSONResponse` for you, converting it to a `dict`, etc. All that by default.

Now, let's see how you could use that to return a custom response.

        "type": "prometheus",
        "uid": "${datasource}"
      },
      "fieldConfig": {
        "defaults": {
          "color": {
            "mode": "palette-classic"
          },
          "custom": {
            "axisCenteredZero": false,
            "axisColorMode": "text",
            "axisLabel": "",
            "axisPlacement": "auto",
            "barAlignment": 0,
            "drawStyle": "line",

        "type": "prometheus",
        "uid": "${datasource}"
      },
      "fieldConfig": {
        "defaults": {
          "color": {
            "mode": "palette-classic"
          },
          "custom": {
            "axisCenteredZero": false,
            "axisColorMode": "text",
            "axisLabel": "",
            "axisPlacement": "auto",
            "barAlignment": 0,
            "drawStyle": "line",

        "uid": "${DS_PROMETHEUS}"
      },
      "description": "",
      "fieldConfig": {
        "defaults": {
          "color": {
            "mode": "palette-classic"
          },
          "custom": {
            "axisBorderShow": false,
            "axisCenteredZero": false,
            "axisColorMode": "text",
            "axisLabel": "",
            "axisPlacement": "auto",
            "barAlignment": 0,

```

## Install custom exception handlers

You can add custom exception handlers with <a href="https://www.starlette.io/exceptions/" class="external-link" target="_blank">the same exception utilities from Starlette</a>.

Let's say you have a custom exception `UnicornException` that you (or a library you use) might `raise`.

And you want to handle this exception globally with FastAPI.

  virtual ImmediateExecutionContext* GetContext() const = 0;

  // Following two methods are used to support custom device.
  // Return true if the inputs contain custom device tensor handle. It means
  // that the argument need to be handled by a custom device.
  virtual bool HasCustomDeviceInput() const = 0;

  virtual const tensorflow::OpDef* OpDef() const = 0;

 * the symmetry of {@code equals}. Custom definitions of equality are usually based on an interface,
 * such as {@code Set} or {@code List}, so that the implementation of {@code equals} can cast the
 * object being tested for equality to the custom interface. {@code ForwardingObject} implements no
 * such custom interfaces directly; they are implemented only in subclasses. Therefore, forwarding

  set -e ; # reset `e` as active
  return 0
}

# runCommand ($@)
# Run custom mc command
runCommand() {
  ${MC} "$@"
  return $?
}

# Try connecting to MinIO instance
{{- if .Values.tls.enabled }}
scheme=https
{{- else }}
scheme=http
{{- end }}
connectToMinio $scheme

{{ if .Values.customCommands }}
# Run custom commands
{{- range .Values.customCommands }}
runCommand {{ .command }}
{{- end }}

// It has extra helper functions for handling any/struct/marshal protobuf pain
type Wrapper struct {
	*admin.Clusters
}

// MarshalJSON is a custom marshaller to handle protobuf pain
func (w *Wrapper) MarshalJSON() ([]byte, error) {
	return protomarshal.Marshal(w)
}

// UnmarshalJSON is a custom unmarshaller to handle protobuf pain
func (w *Wrapper) UnmarshalJSON(b []byte) error {
	cd := &admin.Clusters{}

		},
		{
			name:        "custom-uid",
			annotations: map[string]string{annotation.SidecarStatus.Name: "true"},
			customUID:   &customUID,
			customGID:   &customGID,
			golden:      filepath.Join(env.IstioSrc, "cni/pkg/plugin/testdata/custom-uid.txt.golden"),
		},
		{
			name:        "custom-uid-zero",
			annotations: map[string]string{annotation.SidecarStatus.Name: "true"},