/// danger

This is an "advanced" feature.

If you are just starting with **FastAPI** you might want to skip this section.

///

## Use cases

Some use cases include:

* Converting non-JSON request bodies to JSON (e.g. <a href="https://msgpack.org/index.html" class="external-link" target="_blank">`msgpack`</a>).
* Decompressing gzip-compressed request bodies.

// Code generated by avx512test. DO NOT EDIT.

#include "../../../../../../runtime/textflag.h"

TEXT asmtest_avx512_4fmaps(SB), NOSPLIT, $0
	V4FMADDPS 17(SP), [Z0-Z3], K2, Z0                  // 62f27f4a9a842411000000
	V4FMADDPS -17(BP)(SI*4), [Z0-Z3], K2, Z0           // 62f27f4a9a84b5efffffff
	V4FMADDPS 17(SP), [Z10-Z13], K2, Z0                // 62f22f4a9a842411000000
	V4FMADDPS -17(BP)(SI*4), [Z10-Z13], K2, Z0         // 62f22f4a9a84b5efffffff

    public void addInclude(final String urlPattern) {
        try {
            Pattern.compile(urlPattern);
        } catch (final Exception e) {
            if (logger.isWarnEnabled()) {
                logger.warn("Invalid include pattern: {}", urlPattern);
            }
            return;
        }
        if (sessionId == null) {
            cachedIncludeSet.add(urlPattern);
        } else {

// This input was created by taking the instruction productions in
// the old assembler's (6a's) grammar and hand-writing complete
// instructions for each rule, to guarantee we cover the same space.

#include "../../../../../runtime/textflag.h"

TEXT	foo(SB), DUPOK|NOSPLIT, $0

// LTYPE1 nonrem	{ outcode($1, &$2); }
	NEGQ	R11
	NEGQ	4(R11)
	NEGQ	foo+4(SB)

// LTYPE2 rimnon	{ outcode($1, &$2); }
	INT	$4

      jdkVersion.set(8)
      perPackageOption {
        matchingRegex.set(".*\\.internal.*")
        suppress.set(true)
      }
      if (project.file("Module.md").exists()) {
        includes.from(project.file("Module.md"))
      }
      externalDocumentationLink {
        url.set(URI.create("https://square.github.io/okio/3.x/okio/").toURL())

Cipher suites that are only available with TLSv1.3.

<a name="http2_naughty"></a>
#### ² HTTP/2 Cipher Suite Denylist

Cipher suites that are [discouraged for use][http2_denylist] with HTTP/2. OkHttp includes them because better suites are not commonly available. For example, none of the better cipher suites listed above shipped with Android 4.4 or Java 7.

[OkHttp30]: https://square.github.io/okhttp/changelog_3x/#version-300

      direction,
      streamId,
      length,
      formattedType,
      formattedFlags,
    )
  }

  /**
   * Returns a human-readable representation of a `WINDOW_UPDATE` frame. This frame includes the
   * window size increment instead of flags.
   */
  fun frameLogWindowUpdate(
    inbound: Boolean,
    streamId: Int,
    length: Int,
    windowSizeIncrement: Long,
  ): String {

* **Uvicorn**:
    * Will have the best performance, as it doesn't have much extra code apart from the server itself.
    * You wouldn't write an application in Uvicorn directly. That would mean that your code would have to include more or less, at least, all the code provided by Starlette (or **FastAPI**). And if you did that, your final application would have the same overhead as having used a framework and minimizing your app code and bugs.

                writeText(readText().replace("\\Q<lastUpdated>\\E\\d+\\Q</lastUpdated>\\E".toRegex(), "<lastUpdated>${Year.now().value}0101000000</lastUpdated>"))
            }
            localRepository.get().asFileTree.matching { include("**/*.module") }.forEach {
                val content = it.readText()
                    .replace("\"buildId\":\\s+\"\\w+\"".toRegex(), "\"buildId\": \"\"")

# FastAPI CLI

**FastAPI CLI** is a command line program that you can use to serve your FastAPI app, manage your FastAPI project, and more.

When you install FastAPI (e.g. with `pip install "fastapi[standard]"`), it includes a package called `fastapi-cli`, this package provides the `fastapi` command in the terminal.

To run your FastAPI app for development, you can use the `fastapi dev` command:

<div class="termy">

```console