# Stream Data { #stream-data }

If you want to stream data that can be structured as JSON, you should [Stream JSON Lines](../tutorial/stream-json-lines.md).

But if you want to **stream pure binary data** or strings, here's how you can do it.

/// info

Added in FastAPI 0.134.0.

///

## Use Cases { #use-cases }

You could use this if you want to stream pure strings, for example directly from the output of an **AI LLM** service.

        this.pattern = pattern;
    }

    @Override
    public Object getAsObject(final String value) {
        if (isEmpty(value)) {
            return null;
        }
        return DateConversionUtil.toDate(value, pattern);
    }

    @Override
    public String getAsString(final Object value) {
        if (value == null) {
            return null;
        }
        return StringConversionUtil.toString((Date) value, pattern);

这类似于：

```Python
if not (credentials.username == "stanleyjobson") or not (credentials.password == "swordfish"):
    # Return some error
    ...
```

但使用 `secrets.compare_digest()`，可以防御**时差攻击**，更加安全。

### 时差攻击 { #timing-attacks }

什么是**时差攻击**？

假设攻击者试图猜出用户名与密码。

他们发送用户名为 `johndoe`，密码为 `love123` 的请求。

然后，Python 代码执行如下操作：

```Python

                if (declaringClass.isKotlin) ApiSourceFile.Kotlin(sourceFile, sourceRoot)
                else ApiSourceFile.Java(sourceFile, sourceRoot)
            }
        }

    private
    val JApiClass.sourceFilePath: String
        get() = if (isKotlin) kotlinSourceFilePath else javaSourceFilePath

    private

      security-events: write
      # Needed to publish results and get a badge (see publish_results below).
      id-token: write
      # Uncomment the permissions below if installing in a private repository.
      # contents: read
      # actions: read

    steps:
      - name: "Checkout code"
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:

    return requireNonNull(incidentEdgeMap.get(edge));
  }

  @Override
  public @Nullable N removeInEdge(E edge, boolean isSelfLoop) {
    if (!isSelfLoop) {
      return removeOutEdge(edge);
    }
    return null;
  }

  @Override
  public N removeOutEdge(E edge) {
    N previousNode = incidentEdgeMap.remove(edge);

        return this;
    }

    @Override
    public Model getSuperModel(String version) {
        if (superModel == null) {
            String resource = "/org/apache/maven/model/pom-" + version + ".xml";

            InputStream is = getClass().getResourceAsStream(resource);

            if (is == null) {
                throw new IllegalStateException("The super POM " + resource + " was not found"

    /**
     * Method write.
     *
     * @param writer a writer object.
     * @param model a model object.
     * @throws IOException java.io.IOException if any.
     */
    public void write(Writer writer, Model model) throws IOException {
        try {
            delegate.write(writer, model.getDelegate());
        } catch (XMLStreamException e) {

     */
    public SettingsBuildingException(List<SettingsProblem> problems) {
        super(toMessage(problems));

        this.problems = new ArrayList<>();
        if (problems != null) {
            this.problems.addAll(problems);
        }
    }

    /**
     * Gets the problems that caused this exception.
     *

    throwing in 5.0.0, we inadvertently removed the ability for callers to peek the trailers
    (by catching the `IllegalStateException` if they weren't available). This new API restores that
    capability.

 *  Fix: Don't crash on `trailers()` if the response doesn't have a body. We broke [Retrofit] users
    who read the trailers on the `raw()` OkHttp response, after its body was decoded.


## Version 5.0.0