```

</div>

**SANGAT disarankan** agar kamu menulis atau menyalin kode, mengubahnya dan menjalankannya secara lokal.

Dengan menggunakannya di dalam editor, benar-benar memperlihatkan manfaat dari FastAPI, melihat bagaimana sedikitnya kode yang harus kamu tulis, semua pengecekan tipe, pelengkapan otomatis, dll.

---

## Install FastAPI

    ```Python hl_lines="10"
    {!> ../../../docs_src/header_params/tutorial002.py!}
    ```

!!! warning
    Before setting `convert_underscores` to `False`, bear in mind that some HTTP proxies and servers disallow the usage of headers with underscores.

## Duplicate headers

It is possible to receive duplicate headers. That means, the same header with multiple values.

 *
 * <p>This class is not intended as a direct analogue of any existing "option" or "maybe" construct
 * from other programming environments, though it may bear some similarities.
 *
 * <p>An instance of this class is serializable if its reference is absent or is a serializable
 * object.
 *

 *
 * <p>This class is not intended as a direct analogue of any existing "option" or "maybe" construct
 * from other programming environments, though it may bear some similarities.
 *
 * <p>An instance of this class is serializable if its reference is absent or is a serializable
 * object.
 *

at this corner--No, tie 'em together first--they don't reach half
high enough yet--Oh! they'll do well enough; don't be particular--
Here, Bill! catch hold of this rope--Will the roof bear?--Mind
that loose slate--Oh, it's coming down!  Heads below!' (a loud
crash)--`Now, who did that?--It was Bill, I fancy--Who's to go
down the chimney?--Nay, I shan't! YOU do it!--That I won't,

at this corner--No, tie 'em together first--they don't reach half
high enough yet--Oh! they'll do well enough; don't be particular--
Here, Bill! catch hold of this rope--Will the roof bear?--Mind
that loose slate--Oh, it's coming down!  Heads below!' (a loud
crash)--`Now, who did that?--It was Bill, I fancy--Who's to go
down the chimney?--Nay, I shan't! YOU do it!--That I won't,

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o] MMMM[ren] D[a]",LLL:"YYYY[ko] MMMM[ren] D[a] HH:mm",LLLL:"dddd, YYYY[ko] MMMM[ren] D[a] HH:mm",l:"YYYY-M-D",ll:"YYYY[ko] MMM D[a]",lll:"YYYY[ko] MMM D[a] HH:mm",llll:"ddd, YYYY[ko] MMM D[a] HH:mm"},calendar:{sameDay:"[gaur] LT[etan]",nextDay:"[bihar] LT[etan]",nextWeek:"dddd LT[etan]",lastDay:"[atzo] LT[etan]",lastWeek:"[aurreko] dddd LT[etan]",sameElse:"L"},relativeTime:{future:"%s barru",past:"duela %s",s:"segundo batzuk",ss:"%d segundo",m:"minutu bat",mm:"%d minutu",h:"ordu bat",hh:"%d ordu",d:"egun...

// see also: https://registry.in/policies
// Please note, that nic.in is not an official eTLD, but used by most
// government institutions.
in
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ac.in
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