Enum Unsupported 

pub enum Unsupported {
    Streaming {
        header: HeaderName,
        value: HeaderValue,
    },
    Compression {
        encoding: HeaderValue,
    },
    SetCookie {
        name: String,
    },
    Upgrade,
}

A capability the server used and this transport cannot carry.

Exhaustive on purpose. The probe binary keeps finding these one at a time, and each new one should break every match that reports to a developer rather than fall through to a generic message.

Each carries the header that gave it away, not a sentence about it, so Display is the default rendering rather than the only one.

Variants

Streaming

The response body arrives over time rather than all at once.

A protocol handler returns bytes, once. Server-sent events, chunked transfer, and any long-lived body have nowhere to go.

Fields

header: HeaderName

The header that gave it away.

value: HeaderValue

What it said.

Compression

The body is compressed.

Origins::accept removes Accept-Encoding on the way in, so a server that negotiates will not compress. One that compresses unconditionally, or serves bodies compressed ahead of time, reaches WKWebView. It does not decode what a custom protocol hands it, and renders the bytes as text.

Nothing is lost by storing bodies compressed and decompressing before answering, because there is no wire here to save the bytes on.

Fields

encoding: HeaderValue

The Content-Encoding the server applied.

SetCookie

The response sets a cookie.

WebKit drops every Set-Cookie a custom protocol emits, so the value never comes back and the server sees each request as the first.

Fields

name: String

The name of the first cookie the response tried to set.

Upgrade

The response asks to change protocols.

WebSockets need an HTTP upgrade, and there is no connection under a protocol handler to upgrade.

Trait Implementations

impl Clone for Unsupported

fn clone(&self) -> Unsupported

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Unsupported

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

Formats the value using the given formatter.

impl Display for Unsupported

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

Formats the value using the given formatter.

impl Eq for Unsupported

impl Error for Unsupported

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for Unsupported

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Unsupported