Function best_match

modules/mappers/mod_negotiation.c:2271–2414

}

static int best_match(negotiation_state *neg, var_rec **pbest)
{
    int j;
    var_rec *best;
    float bestq = 0.0f;
    enum algorithm_results algorithm_result;
    int may_discard = 0;

    var_rec *avail_recs = (var_rec *) neg->avail_vars->elts;

    /* fetch request dependent variables
     * prefer-language: prefer a certain language.
     */
    const char *preferred_language = apr_table_get(neg->r->subprocess_env,
                                                   "prefer-language");

    /* no-gzip: do not send encoded documents */
    if (apr_table_get(neg->r->subprocess_env, "no-gzip")) {
        may_discard = DISCARD_ALL_ENCODINGS;
    }

    /* gzip-only-text/html: send encoded documents only
     * if they are text/html. (no-gzip has a higher priority).
     */
    else {
        const char *env_value = apr_table_get(neg->r->subprocess_env,
                                              "gzip-only-text/html");

        if (env_value && !strcmp(env_value, "1")) {
            may_discard = DISCARD_ALL_BUT_HTML;
        }
    }

    set_default_lang_quality(neg);

    /*
     * Find the 'best' variant
     * We run the loop possibly twice: if "prefer-language"
     * environment variable is set but we did not find an appropriate
     * best variant. In that case forget the preferred language and
     * negotiate over all variants.
     */

    do {
        best = NULL;

        for (j = 0; j < neg->avail_vars->nelts; ++j) {
            var_rec *variant = &avail_recs[j];

            /* if this variant is encoded somehow and there are special
             * variables set, we do not negotiate it. see above.
             */
            if (   may_discard
                && discard_variant_by_env(variant, may_discard)) {
                continue;
            }

            /* if a language is preferred, but the current variant