# Extending OpenAPI { #extending-openapi }

There are some cases where you might need to modify the generated OpenAPI schema.

In this section you will see how.

## The normal process { #the-normal-process }

The normal (default) process, is as follows.

A `FastAPI` application (instance) has an `.openapi()` method that is expected to return the OpenAPI schema.

// restartProcess starts a new process passing it the active fd's. It
// doesn't fork, but starts a new process using the same environment and
// arguments as when it was originally started. This allows for a newly
// deployed binary to be started. It returns the pid of the newly started
// process when successful.
func restartProcess() error {
	if runtime.GOOS == globalWindowsOSName {

[19515] [INFO] Booting worker with pid: 19515
[19511] [INFO] Started server process [19511]
[19511] [INFO] Waiting for application startup.
[19511] [INFO] Application startup complete.
[19513] [INFO] Started server process [19513]
[19513] [INFO] Waiting for application startup.
[19513] [INFO] Application startup complete.
[19514] [INFO] Started server process [19514]
[19514] [INFO] Waiting for application startup.

                .warn("Version not locked for default bindings plugins ["
                        + "stub-plugin-initialize, "
                        + "stub-plugin-process-resources, "
                        + "stub-plugin-compile, "
                        + "stub-plugin-process-test-resources, "
                        + "stub-plugin-test-compile, "
                        + "stub-plugin-test, "
                        + "stub-plugin-package, "

            it.start();

            final Process currentProcess = jobProcess.getProcess();
            currentProcess.waitFor();
            it.join(5000);

            final int exitValue = currentProcess.exitValue();

            if (logger.isInfoEnabled()) {
                logger.info("Python: Exit Code={} - Process Output:\n{}", exitValue, it.getOutput());
            }

        // simple checks first to short circuit processing below.
        if (WILDCARD.equals(pattern) || pattern.equals(originalId)) {
            result = true;
        } else {
            // process the list
            String[] repos = pattern.split(",");
            for (String repo : repos) {
                repo = repo.trim();
                // see if this is a negative match

        data[15] = 0x00; // type = 0
        data[16] = 40;
        data[17] = 0;
        data[18] = 0;
        data[19] = 0; // remark offset

        // Entry 2: IPC$, type 3 (IPC), remark "Inter-Process Communication"
        System.arraycopy("IPC$".getBytes(StandardCharsets.US_ASCII), 0, data, 20, 4);
        data[34] = 0x03;
        data[35] = 0x00; // type = 3
        data[36] = 60;
        data[37] = 0;

    Request request = new Request.Builder()
        .url("ws://echo.websocket.org")
        .build();
    client.newWebSocket(request, this);

    // Trigger shutdown of the dispatcher's executor so this process exits immediately.
    client.dispatcher().executorService().shutdown();
  }

  @Override public void onOpen(WebSocket webSocket, Response response) {
    webSocket.send("Hello...");
    webSocket.send("...World!");

            try {
                boostDocumentRuleService.store(entity);
            } catch (final Exception e) {
                logger.warn("Failed to process a request.", e);
                throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)));
            }
            return entity;
        }).orElseGet(() -> {

            node.accept(new DependencyGraphDumper(logger::debug));
        }

        try {
            process(result, repoSystem.resolveDependencies(session, depRequest).getArtifactResults());
        } catch (org.eclipse.aether.resolution.DependencyResolutionException e) {
            process(result, e.getResult().getArtifactResults());

            throw new DependencyResolutionException(