MediaType.create("TEXT", "PLAIN"),
            MediaType.parse("text/plain"),
            MediaType.parse("TEXT/PLAIN"),
            MediaType.parse("text /plain"),
            MediaType.parse("TEXT/ plain"),
            MediaType.parse("text / plain"),
            MediaType.create("text", "plain").withParameter("a", "1").withoutParameters())
        .addEqualityGroup(

async def sse_items_string():
    yield ServerSentEvent(data="plain text data")


@app.post("/items/stream-post", response_class=EventSourceResponse)
async def sse_items_post() -> AsyncIterable[Item]:
    for item in items:
        yield item


@app.get("/items/stream-raw", response_class=EventSourceResponse)
async def sse_items_raw():
    yield ServerSentEvent(raw_data="plain text without quotes")

    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.

Plain objects are automatically JSON-serialized as `data:` fields, declare the return type so the serialization is done by Pydantic:

```python
from collections.abc import AsyncIterable

from fastapi import FastAPI

    assertFailsWith<IllegalArgumentException> {
      Request.Builder().method("GET", "abc".toRequestBody("text/plain".toMediaType()))
    }
  }

  @Test
  fun head() {
    server.enqueue(
      MockResponse(
        headers = headersOf("Content-Type", "text/plain"),
      ),
    )
    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .head()

      return new MockResponse()
          .setStatus("HTTP/1.1 404")
          .addHeader("content-type: text/plain; charset=utf-8")
          .setBody("NOT FOUND: " + path);
    } catch (IOException e) {
      return new MockResponse()
          .setStatus("HTTP/1.1 500")
          .addHeader("content-type: text/plain; charset=utf-8")
          .setBody("SERVER ERROR: " + e);
    }
  }

<img src="/img/deployment/https/https05.drawio.svg">

### HTTP Response { #http-response }

The application would process the request and send a **plain (unencrypted) HTTP response** to the TLS Termination Proxy.

    (`text/event-stream`).

    If you yield a plain object (dict, Pydantic model, etc.) instead, it is
    automatically JSON-encoded and sent as the `data:` field.

    All `data` values **including plain strings** are JSON-serialized.

    For example, `data="hello"` produces `data: "hello"` on the wire (with
    quotes).
    """

# TODO(b/173549186): Move Google-internal TF code out of learning/brain
package_group(
    name = "internal",
    packages = [
        "//devtools/python/indexer/...",
        "//learning/brain/keras/...",
        "//learning/brain/mlir/...",
        "//learning/brain/tfrt/...",
        "//learning/lib/ami/simple_ml/...",
        "//learning/pathways/...",

  url: https://github.com/nayeonkinn
pe-brian:
  login: pe-brian
  count: 3
  avatarUrl: https://avatars.githubusercontent.com/u/1783138?u=7e6242eb9e85bcf673fa88bbac9dd6dc3f03b1b5&v=4
  url: https://github.com/pe-brian
maxscheijen:
  login: maxscheijen
  count: 3
  avatarUrl: https://avatars.githubusercontent.com/u/47034840?v=4

In these cases, it could make sense to store the tags in an `Enum`.

**FastAPI** supports that the same way as with plain strings:

{* ../../docs_src/path_operation_configuration/tutorial002b_py310.py hl[1,8:10,13,18] *}

## Summary and description { #summary-and-description }

You can add a `summary` and `description`: