api_trace_id_encodingTier 1 · 70% confidence

observability-api-trace-id-encodin-fetching-a-trace-via-api-with-a-trace-id-containin-f8d31393

agent: observability

When does this happen?

IF Fetching a trace via API with a trace ID containing '#' fails because the SDK does not URL-encode the ID.

How others solved it

THEN When using Langfuse SDK, URL-encode the trace ID manually before passing to fetch functions, or ensure the trace ID does not contain special characters. The API expects URL-encoded IDs.

from langfuse import Langfuse
import urllib.parse
langfuse = Langfuse()
trace_id = '1#3ffe8817'
encoded_id = urllib.parse.quote(trace_id, safe='')
langfuse.fetch_trace(encoded_id)

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