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@sbglasius
Created October 16, 2012 14:50
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Groovy function that will follow a number of redirects to get the real URL of a webpage/service
def findRealUrl(url) {
HttpURLConnection conn = url.openConnection()
conn.followRedirects = false
conn.requestMethod = 'HEAD'
if(conn.responseCode in [301,302]) {
if (conn.headerFields.'Location') {
return findRealUrl(conn.headerFields.Location.first().toURL())
} else {
throw new RuntimeException('Failed to follow redirect')
}
}
return url
}
@gferon
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gferon commented Jul 14, 2016

I think you are missing a url.connect() statement before testing the responseCode.

@dularion
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really cool snippet! but note: a requestMethod of "GET" might in some cases be more accurate. It was in our case

@gernotstarke
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numerous servers (ie amazon.com) return a 50x when given a HEAD request...

@mahmoudimus
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def findRealUrl(url, METHOD='HEAD') {
    HttpURLConnection conn = url.openConnection()
    conn.followRedirects = false
    conn.requestMethod = METHOD
    conn.connect()
    if(conn.responseCode in [301,302]) {
        if (conn.headerFields.'Location') {
          return findRealUrl(conn.headerFields.Location.first().toURL())
        } else {
            throw new RuntimeException('Failed to follow redirect')
        }
    }
    return url
}

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