# `Mutare.Plug.Header`
[🔗](https://github.com/foxbenjaminfox/mutare_plug/blob/v0.2.1/lib/mutare/plug/header.ex#L1)

`:resp_header` — removes explicit response-header mutations. A surviving mutant means no
test depends on this code setting or deleting that response header.

    put_resp_header(conn, "cache-control", "no-store")  # → conn
    conn |> delete_resp_header("x-legacy")              # → conn
    put_resp_content_type(conn, "application/json")     # → conn

Removing `put_resp_content_type/2,3` leaves the response on the upstream (or default)
content type, so a survivor means no test pins the response's `content-type` header —
the charset-carrying arity 3 included.

Matches `Plug.Conn.put_resp_header/3`, `Plug.Conn.delete_resp_header/2`, and
`Plug.Conn.put_resp_content_type/2,3` written directly, aliased, or bare-imported. String
values themselves are left to Mutare's built-in string mutators.

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*Consult [api-reference.md](api-reference.md) for complete listing*