src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java [128:153]:
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        if (refOrHash.startsWith(Constants.R_TAGS)) {
            String tagUrl = buildTemplateWithRemote("{+server}{?p}{;a,h}", remote)
                    .set("a", "tag")
                    .set("h", refOrHash)
                    .expand();
            Document doc;
            try {
                doc = fetchDocument(tagUrl);
            } catch (HttpStatusException e) {
                if (e.getStatusCode() == 404) {
                    // must be a lightweight tag
                    doc = null;
                } else {
                    throw e;
                }
            }
            if (doc != null) {
                Elements elements = doc.select("table.object_header tr td span.datetime");
                try {
                    return new SimpleDateFormat(RFC_2822).parse(elements.get(0).text())
                            .getTime();
                } catch (ParseException e) {
                    throw new IOException(
                            "Unexpected date format, expected RFC 2822, got " + elements.get(1).text());
                } catch (IndexOutOfBoundsException e) {
                    throw new IOException(
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src/main/java/org/apache/jenkins/gitpubsub/ASFGitSCMFileSystem.java [402:427]:
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            if (refOrHash.startsWith(Constants.R_TAGS)) {
                String tagUrl = buildTemplateWithRemote("{+server}{?p}{;a,h}", remote)
                        .set("a", "tag")
                        .set("h", refOrHash)
                        .expand();
                Document doc;
                try {
                    doc = fetchDocument(tagUrl);
                } catch (HttpStatusException e) {
                    if (e.getStatusCode() == 404) {
                        // must be a lightweight tag
                        doc = null;
                    } else {
                        throw e;
                    }
                }
                if (doc != null) {
                    Elements elements = doc.select("table.object_header tr td span.datetime");
                    try {
                        return new SimpleDateFormat(RFC_2822).parse(elements.get(0).text())
                                .getTime();
                    } catch (ParseException e) {
                        throw new IOException(
                                "Unexpected date format, expected RFC 2822, got " + elements.get(1).text());
                    } catch (IndexOutOfBoundsException e) {
                        throw new IOException(
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