---
title: "Call a function"
description: "Call a Functions function over its HTTPS URL with curl or from MyAccount with Post Request, and what the default CORS and body rules mean."
content_type: "how-to"
product: "functions"
platform: "MyAccount"
url: "/myaccount/functions/how-to/call-a-function/"
topic: ["call"]
relationships: {"requires":["/myaccount/functions/how-to/create-a-function/"]}
---

# Call a function

Call a function over its public HTTPS URL, from the command line with `curl` or from MyAccount
with **Post Request**. The URL has the form
`https://<function-name>-<suffix>.serverless.e2enetworks.net/`. `<function-name>` is the name you
gave the function. The suffix is the same for every function in your account.

## Before you begin

You need a function whose **Status** reads **Running**. To copy its **URL**, select the function
in the Functions list and open the **Info** tab below the list. The function's own page shows the
URL too.

## Call the function with curl

A GET request returns the function's response:

```bash
curl https://<function-name>-<suffix>.serverless.e2enetworks.net/
```

A POST request with a JSON body does the same:

```bash
curl -X POST -H "Content-Type: application/json" -d '{"key": "value"}' \
  https://<function-name>-<suffix>.serverless.e2enetworks.net/
```

Replace the address with your function's **URL**. The response is whatever the handler returns.

## Call the function from MyAccount

1. In **Compute > Functions**, click the function's name to open its page.
2. Click **Try**. The **Enter Arguments** panel opens.
3. In **User Input**, enter the JSON arguments for the call.
4. Click **Post Request**.

The response shows in **Output**, with **Runtime Logs** beside it.

## How the function answers

In the Python and Node.js HTTP runtimes, a function answers cross-origin requests from any
origin by default. The response carries `Access-Control-Allow-Origin: *`.

In the same runtimes, a function accepts JSON bodies up to 10 MB by default. Another content
type, such as `text/plain`, gets HTTP 415. A larger body gets HTTP 413. You can change these
defaults, and which origins a browser can call it from, in the function's init function. See
[Requests and responses](/myaccount/functions/concepts/requests-and-responses/).

In the FastAPI, Flask, and Express runtimes, your app decides what it accepts, and the init
function does not apply. See
[FastAPI, Flask, and Express runtimes](/myaccount/functions/concepts/requests-and-responses/#fastapi-flask-and-express-runtimes).

## Check that the call worked

You will see the handler's response to your request, either in the terminal for `curl` or in
**Output** for **Post Request**. The **Invocation Count** on the **Info** tab and in the
**Monitoring** chart counts each call.

If the call returns an error status, or **Output** says the function provided no response, see
[Troubleshooting Functions](/myaccount/functions/troubleshooting/functions/).