---
name: "TSMimeHdrFieldAppend"
section: "3ts"
platform: "linux"
package: "trafficserver-dev"
version: "9.2.5+ds-0+deb12u4"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/TSMimeHdrFieldAppend"
---

# TSMimeHdrFieldAppend(3ts)

TSMimeHdrFieldAppend API function

## NAME

TSMimeHdrFieldAppend - TSMimeHdrFieldAppend API function

## SYNOPSIS

```
#include <ts/ts.h>
```

- ***TSReturnCode* TSMimeHdrFieldAppend(*TSMBuffer* bufp, *TSMLoc* hdr, *TSMLoc* field)**

  ## DESCRIPTION

Attaches a MIME *field* to a header. The header is represented by the *bufp* and *hdr* arguments which should have been obtained by a call to *TSHttpTxnClientReqGet()* or similar. If the field in *field* was created by calling *TSMimeHdrFieldCreateNamed()* the same *bufp* and *hdr* passed to that should be passed to this function.

Returns **TS\_SUCCESS** if the *field* was attached to the header, **TS\_ERROR** if it was not. Fields cannot be attached to read only headers.

## COPYRIGHT

2026, dev@trafficserver.apache.org