In many cases your application could need some external settings or configurations, for example secret keys, database credentials, credentials for email services, etc.

Most of these settings are variable (can change), like database URLs. And many could be sensitive, like secrets.

For this reason it's common to provide them in environment variables that are read by the application.

/// tip

* Upload edilen dosyadan metadata alabilirsiniz.
* [file-like](https://docs.python.org/3/glossary.html#term-file-like-object) bir `async` arayüze sahiptir.
* [`SpooledTemporaryFile`](https://docs.python.org/3/library/tempfile.html#tempfile.SpooledTemporaryFile) nesnesini dışa açar; bunu, file-like nesne bekleyen diğer library’lere doğrudan geçebilirsiniz.

### `UploadFile` { #uploadfile }

It's relatively tightly coupled with relational databases (like MySQL or PostgreSQL), so, having a NoSQL database (like Couchbase, MongoDB, Cassandra, etc) as the main store engine is not very easy.

<img src="/img/tutorial/security/image04.png">

After authenticating in the system, you will see it like:

<img src="/img/tutorial/security/image05.png">

### Get your own user data { #get-your-own-user-data }

Now use the operation `GET` with the path `/users/me`.

You will get your user's data, like:

```JSON
{
  "username": "johndoe",
  "email": "******@****.***",
  "full_name": "John Doe",

you understand what you are doing ## ########## ## GC configuration 8-13:-XX:+UseConcMarkSweepGC 8-13:-XX:CMSInitiatingOccupan=75 8-13:-XX:+UseCMSInitiatingOccu ## G1GC Configuration # to use G1GC, uncomment the next two lines and update the version on the # following three lines to your version of the JDK # 8-13:-XX:-UseConcMarkSweepGC # 8-13:-XX:-UseCMSInitiatingOccu 14-:-XX:+UseG1GC 14-:-XX:G1ReservePercent=25 14-:-XX:InitiatingHeapOccupa=30 ## JVM temporary directory -Djava.io.tmpdir=${ES_TMPDIR}...

you understand what you are doing ## ########## ## GC configuration 8-13:-XX:+UseConcMarkSweepGC 8-13:-XX:CMSInitiatingOccupan=75 8-13:-XX:+UseCMSInitiatingOccu ## G1GC Configuration # to use G1GC, uncomment the next two lines and update the version on the # following three lines to your version of the JDK # 8-13:-XX:-UseConcMarkSweepGC # 8-13:-XX:-UseCMSInitiatingOccu 14-:-XX:+UseG1GC 14-:-XX:G1ReservePercent=25 14-:-XX:InitiatingHeapOccupa=30 ## JVM temporary directory -Djava.io.tmpdir=${ES_TMPDIR}...

          }
        });
      }
    ```

### Accessing Headers ([.kt][AccessHeadersKotlin], [.java][AccessHeadersJava])

        assertNotNull(output);
        assertTrue(output.contains("00000:"));

        // Calculate expected number of lines
        int expectedLines = (size + 15) / 16;
        String[] lines = output.split(System.getProperty("line.separator"));
        assertTrue(lines.length >= expectedLines);
    }

    @Test
    @DisplayName("Should handle hexdump with offset")
    void testHexdumpWithOffset() {

# Streaming

## Stream JSON Lines

To stream JSON Lines, declare the return type and use `yield` to return the data.

```python
@app.get("/items/stream")
async def stream_items() -> AsyncIterable[Item]:
    for item in items:
        yield item
```

## Server-Sent Events (SSE)

To stream Server-Sent Events, use `response_class=EventSourceResponse` and `yield` items from the endpoint.

    }

    private
    fun findEndOfListSection(content: String, startAfterIntro: Int): Int {
        val lines = content.substring(startAfterIntro).lines()
        var pos = startAfterIntro
        var pastBlankLine = false
        for (line in lines) {
            if (pastBlankLine && !line.startsWith("- ") && line.isNotBlank()) {
                return pos
            }