alibabacloud-gateway-pop/php/src/Client.php [377:385]:
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    public function buildCanonicalizedHeaders($headers)
    {
        $canonicalizedHeaders = "";
        $sortedHeaders = $this->getSignedHeaders($headers);
        foreach ($sortedHeaders as $header) {
            $canonicalizedHeaders = "" . $canonicalizedHeaders . "" . $header . ":" . StringUtil::trim(@$headers[$header]) . "\n";
        }
        return $canonicalizedHeaders;
    }
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alibabacloud-gateway-fc/php/src/Client.php [417:425]:
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    public function buildCanonicalizedHeadersForPop($headers)
    {
        $canonicalizedHeaders = "";
        $sortedHeaders = $this->getSignedHeaders($headers);
        foreach ($sortedHeaders as $header) {
            $canonicalizedHeaders = "" . $canonicalizedHeaders . "" . $header . ":" . StringUtil::trim(@$headers[$header]) . "\n";
        }
        return $canonicalizedHeaders;
    }
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