CLI构建http request

 private static Request buildQueryRequest(ClientSession session, String query)

    { //看到这里了

        Request.Builder builder = preparePost()

                .setUri(uriBuilderFrom(session.getServer()).replacePath("/v1/statement").build())

                .setBodyGenerator(createStaticBodyGenerator(query, UTF_8));

 

        if (session.getUser() != null) {

            builder.setHeader(PrestoHeaders.PRESTO_USER, session.getUser());

        }

        if (session.getSource() != null) {

            builder.setHeader(PrestoHeaders.PRESTO_SOURCE, session.getSource());

        }

        if (session.getCatalog() != null) {

            builder.setHeader(PrestoHeaders.PRESTO_CATALOG, session.getCatalog());

        }

        if (session.getSchema() != null) {

            builder.setHeader(PrestoHeaders.PRESTO_SCHEMA, session.getSchema());

        }

        builder.setHeader(PrestoHeaders.PRESTO_TIME_ZONE, session.getTimeZoneId());

        builder.setHeader(PrestoHeaders.PRESTO_LANGUAGE, session.getLocale().toLanguageTag());

        builder.setHeader(USER_AGENT, USER_AGENT_VALUE);

 

        Map<String, String> property = session.getProperties();

        for (Entry<String, String> entry : property.entrySet()) {

            builder.addHeader(PrestoHeaders.PRESTO_SESSION, entry.getKey() + "=" + entry.getValue());

        }

 

        builder.setHeader(PrestoHeaders.PRESTO_TRANSACTION_ID, session.getTransactionId() == null ? "NONE" : session.getTransactionId());

 

        return builder.build();

    }

这段代码是构造HTTP请求的，下面解释具体做了哪些事情！

===通过抓包，截图如下：