Enum HeaderEditMode 

pub enum HeaderEditMode {
    Append,
    SetIfAbsent,
    Set,
}

How apply_response_header_edits should interpret a per-edit value.

The implicit empty-val Append → delete encoding is still supported (so legacy operator-supplied [[...frontends.headers]] entries work unchanged); the explicit modes give typed policies finer control:

• Append: drop the legacy delete shortcut for empty val, and append every other entry before the end-of-headers flag.
• SetIfAbsent: skip the insert when kawa.blocks already carries a non-elided header with the same name (case-insensitive). HSTS uses this by default to preserve a backend-supplied Strict-Transport-Security (RFC 6797 §6.1 single-header requirement).
• Set: delete every existing header with the matching name, then insert the new entry. Use when the operator wants their typed policy to override any backend-supplied value (the force_replace_backend = true HSTS shape, for example).

Variants

Append

Append the header before the end-of-headers flag. Empty val is interpreted as a delete (legacy behaviour preserved).

SetIfAbsent

Skip the insert if kawa.blocks already contains a non-elided header whose name matches key case-insensitively. Otherwise behave like Append.

Set

Delete every existing header with the matching name, then insert the new value. Equivalent to two operator-defined edits (delete + append) but safer to express as one typed entry.

Trait Implementations

impl Clone for HeaderEditMode

fn clone(&self) -> HeaderEditMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HeaderEditMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for HeaderEditMode

fn default() -> HeaderEditMode

Returns the “default value” for a type.

impl PartialEq for HeaderEditMode

fn eq(&self, other: &HeaderEditMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for HeaderEditMode

impl Eq for HeaderEditMode

impl StructuralPartialEq for HeaderEditMode