---
title: countOfRequestHeaderBytesSent
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/urlsessiontasktransactionmetrics/countofrequestheaderbytessent
---

# countOfRequestHeaderBytesSent

The number of bytes transferred for the request header.

## Declaration

```swift
var countOfRequestHeaderBytesSent: Int64 { get }
```

## See Also

### Accessing data transfer metrics

- [countOfRequestBodyBytesBeforeEncoding](foundation/urlsessiontasktransactionmetrics/countofrequestbodybytesbeforeencoding.md)
- [countOfRequestBodyBytesSent](foundation/urlsessiontasktransactionmetrics/countofrequestbodybytessent.md)
- [countOfResponseBodyBytesAfterDecoding](foundation/urlsessiontasktransactionmetrics/countofresponsebodybytesafterdecoding.md)
- [countOfResponseBodyBytesReceived](foundation/urlsessiontasktransactionmetrics/countofresponsebodybytesreceived.md)
- [countOfResponseHeaderBytesReceived](foundation/urlsessiontasktransactionmetrics/countofresponseheaderbytesreceived.md)