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The current style in variable handlers returning NGX_OK is to either set v->not_found to 1, or to initialize the entire ngx_http_variable_value_t structure. In theory, always setting v->valid = 1 for NGX_OK would be useful, which would mean that the value was computed and is thus valid, including the special case of v->not_found = 1. But currently that's not the case and causes the (v->valid || v->not_found) check to access an uninitialized v->valid value, which is safe only because its value doesn't matter when v->not_found is set.