Tapper Plug v0.5.0 Tapper.Plug.HeaderPropagation.B3Multi View Source
Supports encoding and decoding a Tapper trace context in the original
B3 propagation format,
typically represented in HTTP(S) as a set of x-b3-*
headers.
Link to this section Summary
Functions
decode x-b3-*
headers to a tagged trace context
Encode a Tapper id into a list of B3 propagation headers
Link to this section Functions
decode x-b3-*
headers to a tagged trace context.
Link to this function
encode(idOrDestructed)
View Source
encode(Tapper.Id.t() | tuple()) :: [{binary(), binary()}]
Encode a Tapper id into a list of B3 propagation headers.
i.e. a list of 2-tuples like {"x-b3-traceid", "463ac35c9f6413ad48485a3953bb6124"}
.
This encodes headers in the original B3 multi-header format, to use the B3 Single format,
use Tapper.Plug.HeaderPropagation.B3Single.encode_value/1
.
Example
id = Tapper.start_span(id, name: "foo")
...
headers = Tapper.Plug.HeaderPropagation.B3Multi.encode(id)
response = HTTPoison.get("http://some.service.com/some/api", headers)