---
title: "CFHTTPMessageSetHeaderFieldValue(_:_:_:)"
framework: cfnetwork
role: symbol
role_heading: Function
path: "cfnetwork/cfhttpmessagesetheaderfieldvalue(_:_:_:)"
---

# CFHTTPMessageSetHeaderFieldValue(_:_:_:)

Sets the value of a header field in an HTTP message.

## Declaration

```swift
func CFHTTPMessageSetHeaderFieldValue(_ message: CFHTTPMessage, _ headerField: CFString, _ value: CFString?)
```

## Parameters

- `message`: The message to modify.
- `headerField`: The header field to set.
- `value`: The value to set.

## See Also

### HTTP Messages

- [CFHTTPMessage](cfnetwork/cfhttpmessage.md)
- [CFHTTPMessageAddAuthentication(_:_:_:_:_:_:)](cfnetwork/cfhttpmessageaddauthentication(_:_:_:_:_:_:).md)
- [CFHTTPMessageAppendBytes(_:_:_:)](cfnetwork/cfhttpmessageappendbytes(_:_:_:).md)
- [CFHTTPMessageApplyCredentialDictionary(_:_:_:_:)](cfnetwork/cfhttpmessageapplycredentialdictionary(_:_:_:_:).md)
- [CFHTTPMessageApplyCredentials(_:_:_:_:_:)](cfnetwork/cfhttpmessageapplycredentials(_:_:_:_:_:).md)
- [CFHTTPMessageCopyAllHeaderFields(_:)](cfnetwork/cfhttpmessagecopyallheaderfields(_:).md)
- [CFHTTPMessageCopyBody(_:)](cfnetwork/cfhttpmessagecopybody(_:).md)
- [CFHTTPMessageCopyHeaderFieldValue(_:_:)](cfnetwork/cfhttpmessagecopyheaderfieldvalue(_:_:).md)
- [CFHTTPMessageCopyRequestMethod(_:)](cfnetwork/cfhttpmessagecopyrequestmethod(_:).md)
- [CFHTTPMessageCopyRequestURL(_:)](cfnetwork/cfhttpmessagecopyrequesturl(_:).md)
- [CFHTTPMessageCopyResponseStatusLine(_:)](cfnetwork/cfhttpmessagecopyresponsestatusline(_:).md)
- [CFHTTPMessageCopySerializedMessage(_:)](cfnetwork/cfhttpmessagecopyserializedmessage(_:).md)
- [CFHTTPMessageCopyVersion(_:)](cfnetwork/cfhttpmessagecopyversion(_:).md)
- [CFHTTPMessageCreateCopy(_:_:)](cfnetwork/cfhttpmessagecreatecopy(_:_:).md)
- [CFHTTPMessageCreateEmpty(_:_:)](cfnetwork/cfhttpmessagecreateempty(_:_:).md)