In the next chapters, I'll give you more **concrete recipes** to deploy FastAPI applications.

But for now, let's check these important **conceptual ideas**. These concepts also apply to any other type of web API. 💡

## Security - HTTPS { #security-https }

In the [previous chapter about HTTPS](https.md){.internal-link target=_blank} we learned about how HTTPS provides encryption for your API.

  }

  private fun OkHttpClient.newCallWithListener(request: Request): Call =
    newCall(request)
      .apply {
        addEventRecorder(eventRecorder)
      }

  private fun Call.cloneWithListener(): Call =
    clone()
      .apply {
        addEventRecorder(eventRecorder)
      }

  private fun Call.addEventRecorder(eventRecorder: EventRecorder) {

        for (final UnaryOperator<String> rule : docSettingRewriteRuleList) {
            source = rule.apply(source);
        }
        return source;
    }

    /**
     * Adds a rewrite rule for document settings.
     *
     * @param rule the rewrite rule to apply to document settings
     */
    public void addDocumentSettingRewriteRule(final UnaryOperator<String> rule) {

                 * lookup for FOO using BCAST should not fail because of that
                 * name cached from WINS.
                 *
                 * So, here we apply the source addresses hashCode to each name to
                 * make them specific to who resolved the name.
                 */

                srcHashCode = request.addr.hashCode();

    }

    /**
     * Gets plugin JAR files from the plugin directory that match the specified filter.
     *
     * @param filter the FilenameFilter to apply when selecting plugin JAR files
     * @return an array of File objects representing matching plugin JAR files, or empty array if none found
     */
    public static File[] getPluginJarFiles(final FilenameFilter filter) {

    /** Log level for this job execution */
    protected String logLevel;

    /** Suffix to append to log file names */
    protected String logSuffix = StringUtil.EMPTY;

    /** List of JVM options to apply when executing the job */
    protected List<String> jvmOptions = new ArrayList<>();

    /** Lasta environment configuration */
    protected String lastaEnv;

	encrypt.SseKmsKeyID:          true,
	encrypt.SseEncryptionContext: true,
	encrypt.SseCustomerAlgorithm: true,
	encrypt.SseCustomerKey:       true,
	encrypt.SseCustomerKeyMD5:    true,
}

// checkPostPolicy - apply policy conditions and validate input values.
// Note that content-length-range is checked in the API handler function PostPolicyBucketHandler.
// formValues is the already-canonicalized form values from the POST request.

// but it's easy enough for us to keep it working. https://github.com/square/okhttp/issues/8826
tasks.withType<KotlinCompile> {
  compilerOptions {
    freeCompilerArgs = listOf("-module-name=okhttp")
  }
}

apply(plugin = "io.github.usefulness.maven-sympathy")

mavenPublishing {
  configure(KotlinMultiplatform(javadocJar = JavadocJar.Empty(), androidVariantsToPublish = listOf("release")))

## To `async` or not to `async` { #to-async-or-not-to-async }

As dependencies will also be called by **FastAPI** (the same as your *path operation functions*), the same rules apply while defining your functions.

You can use `async def` or normal `def`.

    }

    /**
     * Creates a Type-2 message with the specified parameters.
     *
     * @param tc
     *            context to use
     * @param flags
     *            The flags to apply to this message.
     * @param challenge
     *            The challenge from the domain controller/server.
     * @param target
     *            The authentication target.
     */