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9ded834adc
forwarded header option (rfc7239) deals with sample expressions in two steps: first a sample expression string is extracted from the config file and later in startup sequence this string is converted into the resulting sample_expr. We need to perform these two steps because we cannot compile the expr too early in the parsing sequence. (or we would miss some context) Because of this, we have two dinstinct structure members (expr and expr_s) for each 7239 field supporting sample expressions. This is not cool, because we're bloating the http forwarded config structure, and thus, bloating proxy config structure. To address this, we now merge both expr and expr_s members inside a single union to regain some space. This forces us to perform some additional logic to make sure to use the proper structure member at different parsing steps. Thanks to this, we're also able to free/release related config hints and sample expression strings as soon as the sample expression compilation is finished.