示例#1
0
char *
passenger_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    passenger_loc_conf_t         *prev = parent;
    passenger_loc_conf_t         *conf = child;

    u_char                       *p;
    size_t                        size;
    uintptr_t                    *code;
    ngx_uint_t                    i;
    ngx_str_t                    *prev_base_uris, *base_uri;
    ngx_str_t                    *prev_union_station_filters, *union_station_filter;
    ngx_keyval_t                 *src;
    ngx_hash_init_t               hash;
    ngx_http_script_compile_t     sc;
    ngx_http_script_copy_code_t  *copy;

    #include "MergeLocationConfig.c"
    if (prev->options_cache.data == NULL) {
        cache_loc_conf_options(cf, prev);
    }
    cache_loc_conf_options(cf, conf);
    
    if (prev->base_uris != NGX_CONF_UNSET_PTR) {
        if (conf->base_uris == NGX_CONF_UNSET_PTR) {
            conf->base_uris = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
            if (conf->base_uris == NULL) {
                return NGX_CONF_ERROR;
            }
        }
        
        prev_base_uris = (ngx_str_t *) prev->base_uris->elts;
        for (i = 0; i < prev->base_uris->nelts; i++) {
            base_uri = (ngx_str_t *) ngx_array_push(conf->base_uris);
            if (base_uri == NULL) {
                return NGX_CONF_ERROR;
            }
            *base_uri = prev_base_uris[i];
        }
    }
    
    if (prev->union_station_filters != NGX_CONF_UNSET_PTR) {
        if (conf->union_station_filters == NGX_CONF_UNSET_PTR) {
            conf->union_station_filters = ngx_array_create(cf->pool, 4, sizeof(ngx_str_t));
            if (conf->union_station_filters == NULL) {
                return NGX_CONF_ERROR;
            }
        }
        
        prev_union_station_filters = (ngx_str_t *) prev->union_station_filters->elts;
        for (i = 0; i < prev->union_station_filters->nelts; i++) {
            union_station_filter = (ngx_str_t *) ngx_array_push(conf->union_station_filters);
            if (union_station_filter == NULL) {
                return NGX_CONF_ERROR;
            }
            *union_station_filter = prev_union_station_filters[i];
        }
    }

    /******************************/
    /******************************/

    if (conf->upstream_config.store != 0) {
        ngx_conf_merge_value(conf->upstream_config.store,
                                  prev->upstream_config.store, 0);

        if (conf->upstream_config.store_lengths == NULL) {
            conf->upstream_config.store_lengths = prev->upstream_config.store_lengths;
            conf->upstream_config.store_values = prev->upstream_config.store_values;
        }
    }

    ngx_conf_merge_uint_value(conf->upstream_config.store_access,
                              prev->upstream_config.store_access, 0600);

    ngx_conf_merge_value(conf->upstream_config.buffering,
                         prev->upstream_config.buffering, 0);

    ngx_conf_merge_value(conf->upstream_config.ignore_client_abort,
                         prev->upstream_config.ignore_client_abort, 0);

    ngx_conf_merge_ptr_value(conf->upstream_config.local,
                             prev->upstream_config.local, NULL);

    ngx_conf_merge_msec_value(conf->upstream_config.connect_timeout,
                              prev->upstream_config.connect_timeout, 12000000);

    ngx_conf_merge_msec_value(conf->upstream_config.send_timeout,
                              prev->upstream_config.send_timeout, 12000000);

    ngx_conf_merge_msec_value(conf->upstream_config.read_timeout,
                              prev->upstream_config.read_timeout, 12000000);

    ngx_conf_merge_size_value(conf->upstream_config.send_lowat,
                              prev->upstream_config.send_lowat, 0);

    ngx_conf_merge_size_value(conf->upstream_config.buffer_size,
                              prev->upstream_config.buffer_size,
                              16 * 1024);


    ngx_conf_merge_bufs_value(conf->upstream_config.bufs, prev->upstream_config.bufs,
                              8, 16 * 1024);

    if (conf->upstream_config.bufs.num < 2) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "there must be at least 2 \"passenger_buffers\"");
        return NGX_CONF_ERROR;
    }


    size = conf->upstream_config.buffer_size;
    if (size < conf->upstream_config.bufs.size) {
        size = conf->upstream_config.bufs.size;
    }


    ngx_conf_merge_size_value(conf->upstream_config.busy_buffers_size_conf,
                              prev->upstream_config.busy_buffers_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.busy_buffers_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.busy_buffers_size = 2 * size;
    } else {
        conf->upstream_config.busy_buffers_size =
                                         conf->upstream_config.busy_buffers_size_conf;
    }

    if (conf->upstream_config.busy_buffers_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_busy_buffers_size\" must be equal to or greater "
             "than the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }

    if (conf->upstream_config.busy_buffers_size
        > (conf->upstream_config.bufs.num - 1) * conf->upstream_config.bufs.size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_busy_buffers_size\" must be less than "
             "the size of all \"passenger_buffers\" minus one buffer");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream_config.temp_file_write_size_conf,
                              prev->upstream_config.temp_file_write_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.temp_file_write_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.temp_file_write_size = 2 * size;
    } else {
        conf->upstream_config.temp_file_write_size =
                                      conf->upstream_config.temp_file_write_size_conf;
    }

    if (conf->upstream_config.temp_file_write_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_temp_file_write_size\" must be equal to or greater than "
             "the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream_config.max_temp_file_size_conf,
                              prev->upstream_config.max_temp_file_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.max_temp_file_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.max_temp_file_size = 1024 * 1024 * 1024;
    } else {
        conf->upstream_config.max_temp_file_size =
                                        conf->upstream_config.max_temp_file_size_conf;
    }

    if (conf->upstream_config.max_temp_file_size != 0
        && conf->upstream_config.max_temp_file_size < size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_max_temp_file_size\" must be equal to zero to disable "
             "temporary files usage or must be equal to or greater than "
             "the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }

    ngx_conf_merge_bitmask_value(conf->upstream_config.ignore_headers,
                                 prev->upstream_config.ignore_headers,
                                 NGX_CONF_BITMASK_SET);

    ngx_conf_merge_bitmask_value(conf->upstream_config.next_upstream,
                              prev->upstream_config.next_upstream,
                              (NGX_CONF_BITMASK_SET
                               |NGX_HTTP_UPSTREAM_FT_ERROR
                               |NGX_HTTP_UPSTREAM_FT_TIMEOUT));

    if (conf->upstream_config.next_upstream & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream_config.next_upstream = NGX_CONF_BITMASK_SET
                                       |NGX_HTTP_UPSTREAM_FT_OFF;
    }

    ngx_conf_merge_path_value(cf,
                              &conf->upstream_config.temp_path,
                              prev->upstream_config.temp_path,
                              &ngx_http_proxy_temp_path);

#if (NGX_HTTP_CACHE)

    ngx_conf_merge_ptr_value(conf->upstream_config.cache,
                             prev->upstream_config.cache, NULL);

    if (conf->upstream_config.cache && conf->upstream_config.cache->data == NULL) {
        ngx_shm_zone_t  *shm_zone;

        shm_zone = conf->upstream_config.cache;

        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "\"scgi_cache\" zone \"%V\" is unknown",
                           &shm_zone->shm.name);

        return NGX_CONF_ERROR;
    }

    ngx_conf_merge_uint_value(conf->upstream_config.cache_min_uses,
                              prev->upstream_config.cache_min_uses, 1);

    ngx_conf_merge_bitmask_value(conf->upstream_config.cache_use_stale,
                              prev->upstream_config.cache_use_stale,
                              (NGX_CONF_BITMASK_SET
                               | NGX_HTTP_UPSTREAM_FT_OFF));

    if (conf->upstream_config.cache_use_stale & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream_config.cache_use_stale = NGX_CONF_BITMASK_SET
                                                | NGX_HTTP_UPSTREAM_FT_OFF;
    }

    if (conf->upstream_config.cache_use_stale & NGX_HTTP_UPSTREAM_FT_ERROR) {
        conf->upstream_config.cache_use_stale |= NGX_HTTP_UPSTREAM_FT_NOLIVE;
    }

    if (conf->upstream_config.cache_methods == 0) {
        conf->upstream_config.cache_methods = prev->upstream_config.cache_methods;
    }

    conf->upstream_config.cache_methods |= NGX_HTTP_GET | NGX_HTTP_HEAD;

    ngx_conf_merge_ptr_value(conf->upstream_config.cache_bypass,
                             prev->upstream_config.cache_bypass, NULL);

    ngx_conf_merge_ptr_value(conf->upstream_config.no_cache,
                             prev->upstream_config.no_cache, NULL);

    ngx_conf_merge_ptr_value(conf->upstream_config.cache_valid,
                             prev->upstream_config.cache_valid, NULL);

    if (conf->cache_key.value.data == NULL) {
        conf->cache_key = prev->cache_key;
    }

    #if NGINX_VERSION_NUM >= 1002000
    ngx_conf_merge_value(conf->upstream_config.cache_lock,
                         prev->upstream_config.cache_lock, 0);

    ngx_conf_merge_msec_value(conf->upstream_config.cache_lock_timeout,
                              prev->upstream_config.cache_lock_timeout, 5000);
    #endif

#endif

    ngx_conf_merge_value(conf->upstream_config.pass_request_headers,
                         prev->upstream_config.pass_request_headers, 1);
    ngx_conf_merge_value(conf->upstream_config.pass_request_body,
                         prev->upstream_config.pass_request_body, 1);

    ngx_conf_merge_value(conf->upstream_config.intercept_errors,
                         prev->upstream_config.intercept_errors, 0);


    hash.max_size = 512;
    hash.bucket_size = ngx_align(64, ngx_cacheline_size);
    hash.name = "passenger_hide_headers_hash";

    if (ngx_http_upstream_hide_headers_hash(cf, &conf->upstream_config,
            &prev->upstream_config, headers_to_hide, &hash)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    if (conf->upstream_config.upstream == NULL) {
        conf->upstream_config.upstream = prev->upstream_config.upstream;
    }

    if (conf->vars_source == NULL) {
        conf->flushes = prev->flushes;
        conf->vars_len = prev->vars_len;
        conf->vars = prev->vars;
        conf->vars_source = prev->vars_source;

        if (conf->vars_source == NULL) {
            return NGX_CONF_OK;
        }
    }

    conf->vars_len = ngx_array_create(cf->pool, 64, 1);
    if (conf->vars_len == NULL) {
        return NGX_CONF_ERROR;
    }

    conf->vars = ngx_array_create(cf->pool, 512, 1);
    if (conf->vars == NULL) {
        return NGX_CONF_ERROR;
    }

    src = conf->vars_source->elts;
    for (i = 0; i < conf->vars_source->nelts; i++) {

        if (ngx_http_script_variables_count(&src[i].value) == 0) {
            copy = ngx_array_push_n(conf->vars_len,
                                    sizeof(ngx_http_script_copy_code_t));
            if (copy == NULL) {
                return NGX_CONF_ERROR;
            }

            copy->code = (ngx_http_script_code_pt)
                                                  ngx_http_script_copy_len_code;
            copy->len = src[i].key.len;


            copy = ngx_array_push_n(conf->vars_len,
                                    sizeof(ngx_http_script_copy_code_t));
            if (copy == NULL) {
                return NGX_CONF_ERROR;
            }

            copy->code = (ngx_http_script_code_pt)
                                                 ngx_http_script_copy_len_code;
            copy->len = src[i].value.len;


            size = (sizeof(ngx_http_script_copy_code_t)
                       + src[i].key.len + src[i].value.len
                       + sizeof(uintptr_t) - 1)
                    & ~(sizeof(uintptr_t) - 1);

            copy = ngx_array_push_n(conf->vars, size);
            if (copy == NULL) {
                return NGX_CONF_ERROR;
            }

            copy->code = ngx_http_script_copy_code;
            copy->len = src[i].key.len + src[i].value.len;

            p = (u_char *) copy + sizeof(ngx_http_script_copy_code_t);

            p = ngx_cpymem(p, src[i].key.data, src[i].key.len);
            ngx_memcpy(p, src[i].value.data, src[i].value.len);

        } else {
            copy = ngx_array_push_n(conf->vars_len,
                                    sizeof(ngx_http_script_copy_code_t));
            if (copy == NULL) {
                return NGX_CONF_ERROR;
            }

            copy->code = (ngx_http_script_code_pt)
                                                 ngx_http_script_copy_len_code;
            copy->len = src[i].key.len;


            size = (sizeof(ngx_http_script_copy_code_t)
                    + src[i].key.len + sizeof(uintptr_t) - 1)
                    & ~(sizeof(uintptr_t) - 1);

            copy = ngx_array_push_n(conf->vars, size);
            if (copy == NULL) {
                return NGX_CONF_ERROR;
            }

            copy->code = ngx_http_script_copy_code;
            copy->len = src[i].key.len;

            p = (u_char *) copy + sizeof(ngx_http_script_copy_code_t);
            ngx_memcpy(p, src[i].key.data, src[i].key.len);


            ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));

            sc.cf = cf;
            sc.source = &src[i].value;
            sc.flushes = &conf->flushes;
            sc.lengths = &conf->vars_len;
            sc.values = &conf->vars;

            if (ngx_http_script_compile(&sc) != NGX_OK) {
                return NGX_CONF_ERROR;
            }
        }

        code = ngx_array_push_n(conf->vars_len, sizeof(uintptr_t));
        if (code == NULL) {
            return NGX_CONF_ERROR;
        }

        *code = (uintptr_t) NULL;


        code = ngx_array_push_n(conf->vars, sizeof(uintptr_t));
        if (code == NULL) {
            return NGX_CONF_ERROR;
        }

        *code = (uintptr_t) NULL;
    }

    code = ngx_array_push_n(conf->vars_len, sizeof(uintptr_t));
    if (code == NULL) {
        return NGX_CONF_ERROR;
    }

    *code = (uintptr_t) NULL;

    return NGX_CONF_OK;
}
示例#2
0
char *
passenger_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    passenger_loc_conf_t         *prev = parent;
    passenger_loc_conf_t         *conf = child;
    ngx_http_core_loc_conf_t     *clcf;

    size_t                        size;
    ngx_hash_init_t               hash;

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);

    if (generated_merge_part(conf, prev, cf) == 0) {
    	return NGX_CONF_ERROR;
    }

    if (prev->options_cache.data == NULL) {
        if (cache_loc_conf_options(cf, prev) != NGX_OK) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "cannot create " PROGRAM_NAME " configuration cache");
            return NGX_CONF_ERROR;
        }
    }

    /******************************/
    /******************************/

    #if (NGX_HTTP_CACHE) && NGINX_VERSION_NUM >= 1007009
        if (conf->upstream_config.store > 0) {
            conf->upstream_config.cache = 0;
        }
        if (conf->upstream_config.cache > 0) {
            conf->upstream_config.store = 0;
        }
    #endif

    #if NGINX_VERSION_NUM >= 1007009
        if (conf->upstream_config.store == NGX_CONF_UNSET) {
            ngx_conf_merge_value(conf->upstream_config.store,
                                      prev->upstream_config.store, 0);

            conf->upstream_config.store_lengths = prev->upstream_config.store_lengths;
            conf->upstream_config.store_values = prev->upstream_config.store_values;
        }
    #else
        if (conf->upstream_config.store != 0) {
            ngx_conf_merge_value(conf->upstream_config.store,
                                      prev->upstream_config.store, 0);

            if (conf->upstream_config.store_lengths == NULL) {
                conf->upstream_config.store_lengths = prev->upstream_config.store_lengths;
                conf->upstream_config.store_values = prev->upstream_config.store_values;
            }
        }
    #endif

    ngx_conf_merge_uint_value(conf->upstream_config.store_access,
                              prev->upstream_config.store_access, 0600);

    #if NGINX_VERSION_NUM >= 1007005
        ngx_conf_merge_uint_value(conf->upstream_config.next_upstream_tries,
                                  prev->upstream_config.next_upstream_tries, 0);
    #endif

    ngx_conf_merge_value(conf->upstream_config.buffering,
                         prev->upstream_config.buffering, 0);

    ngx_conf_merge_value(conf->upstream_config.ignore_client_abort,
                         prev->upstream_config.ignore_client_abort, 0);

    #if NGINX_VERSION_NUM >= 1007007
        ngx_conf_merge_value(conf->upstream_config.force_ranges,
                             prev->upstream_config.force_ranges, 0);
    #endif

    ngx_conf_merge_ptr_value(conf->upstream_config.local,
                             prev->upstream_config.local, NULL);

    ngx_conf_merge_msec_value(conf->upstream_config.connect_timeout,
                              prev->upstream_config.connect_timeout, 12000000);

    ngx_conf_merge_msec_value(conf->upstream_config.send_timeout,
                              prev->upstream_config.send_timeout, 12000000);

    ngx_conf_merge_msec_value(conf->upstream_config.read_timeout,
                              prev->upstream_config.read_timeout, 12000000);

    #if NGINX_VERSION_NUM >= 1007005
        ngx_conf_merge_msec_value(conf->upstream_config.next_upstream_timeout,
                                  prev->upstream_config.next_upstream_timeout, 0);
    #endif

    ngx_conf_merge_size_value(conf->upstream_config.send_lowat,
                              prev->upstream_config.send_lowat, 0);

    ngx_conf_merge_size_value(conf->upstream_config.buffer_size,
                              prev->upstream_config.buffer_size,
                              16 * 1024);

    #if NGINX_VERSION_NUM >= 1007007
        ngx_conf_merge_size_value(conf->upstream_config.limit_rate,
                                  prev->upstream_config.limit_rate, 0);
    #endif


    ngx_conf_merge_bufs_value(conf->upstream_config.bufs, prev->upstream_config.bufs,
                              8, 16 * 1024);

    if (conf->upstream_config.bufs.num < 2) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "there must be at least 2 \"passenger_buffers\"");
        return NGX_CONF_ERROR;
    }


    size = conf->upstream_config.buffer_size;
    if (size < conf->upstream_config.bufs.size) {
        size = conf->upstream_config.bufs.size;
    }


    ngx_conf_merge_size_value(conf->upstream_config.busy_buffers_size_conf,
                              prev->upstream_config.busy_buffers_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.busy_buffers_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.busy_buffers_size = 2 * size;
    } else {
        conf->upstream_config.busy_buffers_size =
                                         conf->upstream_config.busy_buffers_size_conf;
    }

    if (conf->upstream_config.busy_buffers_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_busy_buffers_size\" must be equal to or greater "
             "than the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }

    if (conf->upstream_config.busy_buffers_size
        > (conf->upstream_config.bufs.num - 1) * conf->upstream_config.bufs.size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_busy_buffers_size\" must be less than "
             "the size of all \"passenger_buffers\" minus one buffer");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream_config.temp_file_write_size_conf,
                              prev->upstream_config.temp_file_write_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.temp_file_write_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.temp_file_write_size = 2 * size;
    } else {
        conf->upstream_config.temp_file_write_size =
                                      conf->upstream_config.temp_file_write_size_conf;
    }

    if (conf->upstream_config.temp_file_write_size < size) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_temp_file_write_size\" must be equal to or greater than "
             "the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }


    ngx_conf_merge_size_value(conf->upstream_config.max_temp_file_size_conf,
                              prev->upstream_config.max_temp_file_size_conf,
                              NGX_CONF_UNSET_SIZE);

    if (conf->upstream_config.max_temp_file_size_conf == NGX_CONF_UNSET_SIZE) {
        conf->upstream_config.max_temp_file_size = 1024 * 1024 * 1024;
    } else {
        conf->upstream_config.max_temp_file_size =
                                        conf->upstream_config.max_temp_file_size_conf;
    }

    if (conf->upstream_config.max_temp_file_size != 0
        && conf->upstream_config.max_temp_file_size < size)
    {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
             "\"passenger_max_temp_file_size\" must be equal to zero to disable "
             "temporary files usage or must be equal to or greater than "
             "the maximum of the value of \"passenger_buffer_size\" and "
             "one of the \"passenger_buffers\"");

        return NGX_CONF_ERROR;
    }

    ngx_conf_merge_bitmask_value(conf->upstream_config.ignore_headers,
                                 prev->upstream_config.ignore_headers,
                                 NGX_CONF_BITMASK_SET);

    ngx_conf_merge_bitmask_value(conf->upstream_config.next_upstream,
                              prev->upstream_config.next_upstream,
                              (NGX_CONF_BITMASK_SET
                               |NGX_HTTP_UPSTREAM_FT_ERROR
                               |NGX_HTTP_UPSTREAM_FT_TIMEOUT));

    if (conf->upstream_config.next_upstream & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream_config.next_upstream = NGX_CONF_BITMASK_SET
                                       |NGX_HTTP_UPSTREAM_FT_OFF;
    }

    ngx_conf_merge_path_value(cf,
                              &conf->upstream_config.temp_path,
                              prev->upstream_config.temp_path,
                              &ngx_http_proxy_temp_path);

#if (NGX_HTTP_CACHE)

    #if NGINX_VERSION_NUM >= 1007009
        if (conf->upstream_config.cache == NGX_CONF_UNSET) {
           ngx_conf_merge_value(conf->upstream_config.cache,
                                prev->upstream_config.cache, 0);

           conf->upstream_config.cache_zone = prev->upstream_config.cache_zone;
           conf->upstream_config.cache_value = prev->upstream_config.cache_value;
        }

        if (conf->upstream_config.cache_zone && conf->upstream_config.cache_zone->data == NULL) {
            ngx_shm_zone_t  *shm_zone;

            shm_zone = conf->upstream_config.cache_zone;

            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "\"scgi_cache\" zone \"%V\" is unknown",
                               &shm_zone->shm.name);

            return NGX_CONF_ERROR;
        }
    #else
        ngx_conf_merge_ptr_value(conf->upstream_config.cache,
                                 prev->upstream_config.cache, NULL);

        if (conf->upstream_config.cache && conf->upstream_config.cache->data == NULL) {
            ngx_shm_zone_t  *shm_zone;

            shm_zone = conf->upstream_config.cache;

            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "\"scgi_cache\" zone \"%V\" is unknown",
                               &shm_zone->shm.name);

            return NGX_CONF_ERROR;
        }
    #endif

    ngx_conf_merge_uint_value(conf->upstream_config.cache_min_uses,
                              prev->upstream_config.cache_min_uses, 1);

    ngx_conf_merge_bitmask_value(conf->upstream_config.cache_use_stale,
                              prev->upstream_config.cache_use_stale,
                              (NGX_CONF_BITMASK_SET
                               | NGX_HTTP_UPSTREAM_FT_OFF));

    if (conf->upstream_config.cache_use_stale & NGX_HTTP_UPSTREAM_FT_OFF) {
        conf->upstream_config.cache_use_stale = NGX_CONF_BITMASK_SET
                                                | NGX_HTTP_UPSTREAM_FT_OFF;
    }

    if (conf->upstream_config.cache_use_stale & NGX_HTTP_UPSTREAM_FT_ERROR) {
        conf->upstream_config.cache_use_stale |= NGX_HTTP_UPSTREAM_FT_NOLIVE;
    }

    if (conf->upstream_config.cache_methods == 0) {
        conf->upstream_config.cache_methods = prev->upstream_config.cache_methods;
    }

    conf->upstream_config.cache_methods |= NGX_HTTP_GET | NGX_HTTP_HEAD;

    ngx_conf_merge_ptr_value(conf->upstream_config.cache_bypass,
                             prev->upstream_config.cache_bypass, NULL);

    ngx_conf_merge_ptr_value(conf->upstream_config.no_cache,
                             prev->upstream_config.no_cache, NULL);

    ngx_conf_merge_ptr_value(conf->upstream_config.cache_valid,
                             prev->upstream_config.cache_valid, NULL);

    if (conf->cache_key.value.data == NULL) {
        conf->cache_key = prev->cache_key;
    }

    ngx_conf_merge_value(conf->upstream_config.cache_lock,
                         prev->upstream_config.cache_lock, 0);

    ngx_conf_merge_msec_value(conf->upstream_config.cache_lock_timeout,
                              prev->upstream_config.cache_lock_timeout, 5000);

    ngx_conf_merge_value(conf->upstream_config.cache_revalidate,
                         prev->upstream_config.cache_revalidate, 0);

    #if NGINX_VERSION_NUM >= 1007008
        ngx_conf_merge_msec_value(conf->upstream_config.cache_lock_age,
                                  prev->upstream_config.cache_lock_age, 5000);
    #endif

    #if NGINX_VERSION_NUM >= 1006000
        ngx_conf_merge_value(conf->upstream_config.cache_revalidate,
                             prev->upstream_config.cache_revalidate, 0);
    #endif

#endif

    ngx_conf_merge_value(conf->upstream_config.pass_request_headers,
                         prev->upstream_config.pass_request_headers, 1);
    ngx_conf_merge_value(conf->upstream_config.pass_request_body,
                         prev->upstream_config.pass_request_body, 1);

    ngx_conf_merge_value(conf->upstream_config.intercept_errors,
                         prev->upstream_config.intercept_errors, 0);


    hash.max_size = 512;
    hash.bucket_size = ngx_align(64, ngx_cacheline_size);
    hash.name = "passenger_hide_headers_hash";

    if (ngx_http_upstream_hide_headers_hash(cf, &conf->upstream_config,
            &prev->upstream_config, headers_to_hide, &hash)
        != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    if (conf->upstream_config.upstream == NULL) {
        conf->upstream_config.upstream = prev->upstream_config.upstream;
    }

    if (conf->enabled == 1 /* and not NGX_CONF_UNSET */
     && passenger_main_conf.root_dir.len != 0
     && clcf->handler == NULL /* no handler set by other modules */)
    {
        clcf->handler = passenger_content_handler;
    }

    conf->headers_hash_bucket_size = ngx_align(conf->headers_hash_bucket_size,
                                               ngx_cacheline_size);
    hash.max_size = conf->headers_hash_max_size;
    hash.bucket_size = conf->headers_hash_bucket_size;
    hash.name = "passenger_headers_hash";

    if (merge_headers(cf, conf, prev) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    if (cache_loc_conf_options(cf, conf) != NGX_OK) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "cannot create " PROGRAM_NAME " configuration cache");
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}