# Data Formats and Transport Protocol

## Transport Protocol

The only available transport protocol of the Pricefx backend is **HTTP(S)**.
Standard HTTP headers and return codes as defined in RFC 2616 are used.
The Pricefx API entirely relies on a defined URL scheme and additional data as part of a standard HTTP **POST** request.
If no request body is required, HTTP GET can be used too (unless stated otherwise).

## Data Format

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The payload of the HTTP requests and responses are formatted in **JSON** by default.

JSON is described in RFC 4627 and at [json.org](https://www.json.org/json-en.html).
:::attention
The JSON request should be properly identified by HTTP Header `Content-Type` set to `application/json`.
:::
## Encoding

All strings are **UTF-8** encoded.

### TLS Versions

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Pricefx servers use following TLS protocol versions:

- TLS 1.2
- TLS 1.3