There are some situations in where it's useful to be able to add custom headers to the HTTP error. For example, for some types of security.

You probably won't need to use it directly in your code.

But in case you needed it for an advanced scenario, you can add custom headers:

```Python hl_lines="14"
{!../../docs_src/handling_errors/tutorial002.py!}
```

## Install custom exception handlers

         * higher than the current batchLevel so we will now encode
         * that chained message. Before doing so we must increment
         * the batchLevel of the andx message in case it itself is an
         * andx message and needs to perform the same check as above.
         */

        this.andx.batchLevel = this.batchLevel + 1;

        dst[ start + ANDX_COMMAND_OFFSET ] = this.andxCommand;

    ): Long {
      while (left == 0) {
        source.skip(padding.toLong())
        padding = 0
        if (flags and FLAG_END_HEADERS != 0) return -1L
        readContinuationHeader()
        // TODO: test case for empty continuation header?
      }

      val read = source.read(sink, minOf(byteCount, left.toLong()))
      if (read == -1L) return -1L
      left -= read.toInt()
      return read
    }

 * is used to verify the signature of the "www.squareup.com" certificate.
 *
 * This roles are reversed for client authentication. In that case the client has a private key and
 * a chain of certificates. The server uses a set of trusted root certificates to authenticate the
 * client. Subject alternative names are not used for client authentication.
 */

                ],
            ),
        ):
            return item

    # TODO: enable these tests once/if Form(embed=False) is supported
    # TODO: In that case, define if File() should support example/examples too
    # @app.post("/form_example")
    # def form_example(firstname: str = Form(example="John")):
    #     return firstname

    # @app.post("/form_examples")

  // capacity that the driver deployment will report by creating
  // CSIStorageCapacity objects with capacity information, if set to true.
  //
  // The check can be enabled immediately when deploying a driver.
  // In that case, provisioning new volumes with late binding
  // will pause until the driver deployment has published
  // some suitable CSIStorageCapacity object.
  //
  // Alternatively, the driver can be deployed with the field

  // +optional
  repeated string resourceNames = 4;
}

// SelfSubjectAccessReview checks whether or the current user can perform an action.  Not filling in a
// spec.namespace means "in all namespaces".  Self is a special case, because users should always be able
// to check whether they can perform an action
message SelfSubjectAccessReview {
  // Standard list metadata.

		partNumString := strconv.Itoa(testCase.partNum)
		fi.AddObjectPart(testCase.partNum, "etag."+partNumString, int64(testCase.partNum+humanize.MiByte), ActualSize, UTCNow(), nil, nil)
	}

	// Add failure test case.
	testCases = append(testCases, struct {
		partNum       int
		expectedIndex int
	}{6, -1})

	// Test them.
	for _, testCase := range testCases {

			preparedStmt = v.(*PreparedStmtDB)
		} else {
			preparedStmt = NewPreparedStmtDB(db.ConnPool)
			db.cacheStore.Store(preparedStmtDBKey, preparedStmt)
		}

		switch t := tx.Statement.ConnPool.(type) {
		case Tx:
			tx.Statement.ConnPool = &PreparedStmtTX{
				Tx:             t,
				PreparedStmtDB: preparedStmt,
			}
		default:
			tx.Statement.ConnPool = &PreparedStmtDB{
				ConnPool: db.Config.ConnPool,

;border-radius:.5rem;transition:background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out,-webkit-transform .15s ease-in-out;transition:transform .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;transition:transform .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out,-webkit-transform .15s ease-in-out}@media (prefers-reduced-motion:reduce){.custom-switch...