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docs/en/docs/tutorial/middleware.md
## Create a middleware To create a middleware you use the decorator `@app.middleware("http")` on top of a function. The middleware function receives: * The `request`. * A function `call_next` that will receive the `request` as a parameter. * This function will pass the `request` to the corresponding *path operation*. * Then it returns the `response` generated by the corresponding *path operation*.
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docs/en/docs/reference/background.md
# Background Tasks - `BackgroundTasks` You can declare a parameter in a *path operation function* or dependency function with the type `BackgroundTasks`, and then you can use it to schedule the execution of background tasks after the response is sent. You can import it directly from `fastapi`: ```python from fastapi import BackgroundTasks ```
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docs_src/websockets/tutorial002_an_py310.py
</ul> <script> var ws = null; function connect(event) { var itemId = document.getElementById("itemId") var token = document.getElementById("token") ws = new WebSocket("ws://localhost:8000/items/" + itemId.value + "/ws?token=" + token.value); ws.onmessage = function(event) { var messages = document.getElementById('messages')
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docs/en/docs/tutorial/security/get-current-user.md
# Get Current User In the previous chapter the security system (which is based on the dependency injection system) was giving the *path operation function* a `token` as a `str`: === "Python 3.9+" ```Python hl_lines="12" {!> ../../../docs_src/security/tutorial001_an_py39.py!} ``` === "Python 3.8+" ```Python hl_lines="11" {!> ../../../docs_src/security/tutorial001_an.py!} ``` === "Python 3.8+ non-Annotated"
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docs_src/websockets/tutorial003.py
ws.onmessage = function(event) { var messages = document.getElementById('messages') var message = document.createElement('li') var content = document.createTextNode(event.data) message.appendChild(content) messages.appendChild(message) }; function sendMessage(event) {
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docs/en/docs/tutorial/body-fields.md
Remember that when you import `Query`, `Path`, and others from `fastapi`, those are actually functions that return special classes. !!! tip Notice how each model's attribute with a type, default value and `Field` has the same structure as a *path operation function's* parameter, with `Field` instead of `Path`, `Query` and `Body`. ## Add extra information
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docs/en/docs/tutorial/path-params.md
So, if you run this example and go to <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, you will see a response of: ```JSON {"item_id":"foo"} ``` ## Path parameters with types You can declare the type of a path parameter in the function, using standard Python type annotations:
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docs/en/docs/reference/request.md
# `Request` class You can declare a parameter in a *path operation function* or dependency to be of type `Request` and then you can access the raw request object directly, without any validation, etc. You can import it directly from `fastapi`: ```python from fastapi import Request ``` !!! tip
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docs/en/docs/advanced/dataclasses.md
8. Notice that this *path operation function* uses regular `def` instead of `async def`. As always, in FastAPI you can combine `def` and `async def` as needed. If you need a refresher about when to use which, check out the section _"In a hurry?"_ in the docs about [`async` and `await`](../async.md#in-a-hurry){.internal-link target=_blank}.
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docs_src/generate_clients/tutorial004.js
import * as fs from 'fs' async function modifyOpenAPIFile(filePath) { try { const data = await fs.promises.readFile(filePath) const openapiContent = JSON.parse(data) const paths = openapiContent.paths for (const pathKey of Object.keys(paths)) { const pathData = paths[pathKey] for (const method of Object.keys(pathData)) { const operation = pathData[method] if (operation.tags && operation.tags.length > 0) {
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