# Tutorial - User Guide { #tutorial-user-guide }

This tutorial shows you how to use **FastAPI** with most of its features, step by step.

Each section gradually builds on the previous ones, but it's structured to separate topics, so that you can go directly to any specific one to solve your specific API needs.

It is also built to work as a future reference so you can come back and see exactly what you need.

## Run the code { #run-the-code }

            // attribute name
            scanner.mark();
            scanner.find(END_ATTRIBUTE_NAME);
            String attrName = scanner.region();

            // separator
            scanner.skip(ATTRIBUTE_SEPARATOR);

            // value
            char quote = scanner.getFirst();
            scanner.next();
            StringBuilder attrValue = new StringBuilder();

//   - n > 0: at most n subslices; the last subslice will be the unsplit remainder;
//   - n == 0: the result is nil (zero subslices);
//   - n < 0: all subslices.
//
// To split around the first instance of a separator, see [Cut].
func SplitN(s, sep []byte, n int) [][]byte { return genSplit(s, sep, 0, n) }

// SplitAfterN slices s into subslices after each instance of sep and
// returns a slice of those subslices.

Puedes definir tareas en segundo plano para que se ejecuten *después* de devolver un response.

Esto es útil para operaciones que necesitan ocurrir después de un request, pero para las que el cliente realmente no necesita esperar a que la operación termine antes de recibir el response.

Esto incluye, por ejemplo:

* Notificaciones por email enviadas después de realizar una acción:

     of this section 3.

3.2 When the Program is Distributed as Source Code:

  a) it must be made available under this Agreement, or if the
  Program (i) is combined with other material in a separate file or
  files made available under a Secondary License, and (ii) the initial
  Contributor attached to the Source Code the notice described in
  Exhibit A of this Agreement, then the Program may be made available

            data["client_secret"] = form_data.client_secret
        return data
    ```

    Note that for OAuth2 the scope `items:read` is a single scope in an opaque string.
    You could have custom internal logic to separate it by colon characters (`:`) or
    similar, and get the two parts `items` and `read`. Many applications do that to
    group and organize permissions, you could do it as well in your application, just

## Decision

Use "NullAway" in JSpecify mode to check for null-related errors in Java code.

Consider improper uses of `null` detected by NullAway a compilation error (not a warning, and not a separate CI job to test).

Do not suppress NullAway errors without a justification.
Prefer rearranging the code to avoid the error, unless there is a provable performance penalty or a significant loss of code readability.

     *
     * @param remaining
     *            the remaining to set
     */
    public final void setRemaining(final int remaining) {
        this.remaining = remaining;
    }

    void setParam(final int fid, final long offset, final int maxCount) {
        this.fid = fid;
        this.offset = offset;
        this.maxCount = this.minCount = maxCount;
    }

    @Override

        B.setArtifactId("B");
        C.setArtifactId("C");
        X.setArtifactId("X");
        Y.setArtifactId("Y");
        Z.setArtifactId("Z");
    }

    // This should probably be moved to a separate stub

    public static ProjectBuildList getProjectBuildList(MavenSession session)
            throws InvalidPluginDescriptorException, PluginVersionResolutionException, PluginDescriptorParsingException,

 * processing the response, and extracting child URLs.
 *
 * <p>
 * This class implements the {@link Runnable} interface, allowing it to be executed in a separate thread.
 * It uses various services and components, such as {@link UrlQueueService}, {@link DataService},
 * {@link CrawlerContainer}, {@link LogHelper}, {@link CrawlerClientFactory}, and {@link CrawlerContext},