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Fix x-forwarded-for header processing for ws connections #860

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Merged
merged 2 commits into from
May 6, 2022
Merged

Fix x-forwarded-for header processing for ws connections #860

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96c2aa2
Fix x-forwarded-for header processing for ws connections
bn0ir Jan 11, 2022
e483a1b
Rewrite fabio X-Forwarded-For header set for WS connections based on …
bn0ir Apr 16, 2022
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13 changes: 12 additions & 1 deletion proxy/http_headers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,18 @@ func addHeaders(r *http.Request, cfg config.Proxy, stripPath string) error {
// http proxy which sets it.
ws := r.Header.Get("Upgrade") == "websocket"
if ws {
r.Header.Set("X-Forwarded-For", remoteIP)
clientIP := remoteIP
// If we aren't the first proxy retain prior
// X-Forwarded-For information as a comma+space
// separated list and fold multiple headers into one.
prior, ok := r.Header["X-Forwarded-For"]
omit := ok && prior == nil // Issue 38079: nil now means don't populate the header
if len(prior) > 0 {
clientIP = strings.Join(prior, ", ") + ", " + clientIP
}
if !omit {
r.Header.Set("X-Forwarded-For", clientIP)
}
}

// Issue #133: Setting the X-Forwarded-Proto header to
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