error_code

Shared modeled-error-code extraction. AWS error responses carry the modeled error code (the Smithy shape’s local name) in one of three places, depending on protocol: the X-Amzn-Errortype header (awsJson*, restJson1), a JSON body __type / code field, or a restXml <Code> element. This module pulls that local shape name out — namespace prefix, URI suffix, and Smithy [Charlie,foo] disambiguation suffix all stripped.

Both the retry middleware (aws/retry), which inspects the raw Response inside the retry loop before any typed parsing, and the runtime (aws/internal/client/runtime), which builds the typed ServiceError after the loop, need the same extraction — so it lives here once rather than being duplicated across the two layers.

Values

from_header_value_and_body

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pub fn from_header_value_and_body(
  error_type_header: Result(String, Nil),
  body: BitArray,
) -> String

Like from_headers_and_body but taking the x-amzn-errortype header value as a pre-resolved Result. The retry layer holds a Response (not a header dict) and reads the header via response.get_header, so this entry point lets it reuse the exact same extraction without rebuilding a dict.

from_headers_and_body

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pub fn from_headers_and_body(
  headers: dict.Dict(String, String),
  body: BitArray,
) -> String

Pull the wire-error-type local name out of an error response’s already-lowercased headers + body. Prefers the x-amzn-errortype header (restJson1, awsJson*), then falls back to the body’s __type / code (JSON) or <Code> (restXml). Returns the local shape name with namespace / URI / disambiguation suffixes stripped, or "Unknown" when nothing matches.

normalise

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pub fn normalise(raw: String) -> String

Strip an error-type wire value down to its local Smithy shape name: drop any Type:uri suffix, any , disambiguation list, and any namespace# prefix. Exposed so callers that already hold a raw header value (not a full response) can normalise it consistently.