add resend explanation

open-telemetry · Sep 22, 2022 · 0e0f782 · 0e0f782
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commit 0e0f782
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diff --git a/specification/trace/semantic_conventions/http.md b/specification/trace/semantic_conventions/http.md
@@ -162,6 +162,8 @@ Note that in some cases host and port identifiers in the `Host` header might be
 ### HTTP request retries and redirects
 
 Retries and redirects cause more than one physical HTTP request to be sent.
+A request is resent when an HTTP client library sends more than one HTTP request to satisfy the same API call.
+This may happen due to following redirects, authorization cahllenges, 503 Server Unavailable, network issues, or any other.
 A CLIENT span SHOULD be created for each one of these physical requests.
 No span is created corresponding to the "logical" (encompassing) request.