Function modifyResponseHeader

plugins/esi/esi.cc:1064–1164

}

static int
modifyResponseHeader(TSCont contp, TSEvent event, void *edata)
{
  int             retval   = 0;
  RespHdrModData *mod_data = static_cast<RespHdrModData *>(TSContDataGet(contp));
  TSHttpTxn       txnp     = static_cast<TSHttpTxn>(edata);
  if (event != TS_EVENT_HTTP_SEND_RESPONSE_HDR) {
    TSError("[esi][%s] Unexpected event (%d)", __FUNCTION__, event);
    goto lReturn;
  }
  TSMBuffer bufp;
  TSMLoc    hdr_loc;
  if (TSHttpTxnClientRespGet(txnp, &bufp, &hdr_loc) == TS_SUCCESS) {
    int         n_mime_headers = TSMimeHdrFieldsCount(bufp, hdr_loc);
    TSMLoc      field_loc;
    const char *name, *value;
    int         name_len, value_len;
    for (int i = 0; i < n_mime_headers; ++i) {
      field_loc = TSMimeHdrFieldGet(bufp, hdr_loc, i);
      if (!field_loc) {
        Dbg(dbg_ctl_local, "[%s] Error while obtaining header field #%d", __FUNCTION__, i);
        continue;
      }
      name = TSMimeHdrFieldNameGet(bufp, hdr_loc, field_loc, &name_len);
      if (name) {
        bool destroy_header = false;

        if (Utils::areEqual(name, name_len, SERVER_INTERCEPT_HEADER, SERVER_INTERCEPT_HEADER_LEN)) {
          destroy_header = true;
        } else if (Utils::areEqual(name, name_len, TS_MIME_FIELD_AGE, TS_MIME_LEN_AGE)) {
          destroy_header = true;
        } else if (Utils::areEqual(name, name_len, MIME_FIELD_XESI, MIME_FIELD_XESI_LEN)) {
          destroy_header = true;
        } else if ((name_len > HEADER_MASK_PREFIX_SIZE) && (strncmp(name, HEADER_MASK_PREFIX, HEADER_MASK_PREFIX_SIZE) == 0)) {
          destroy_header = true;
        } else if (mod_data->option_info->private_response &&
                   (Utils::areEqual(name, name_len, TS_MIME_FIELD_CACHE_CONTROL, TS_MIME_LEN_CACHE_CONTROL) ||
                    Utils::areEqual(name, name_len, TS_MIME_FIELD_EXPIRES, TS_MIME_LEN_EXPIRES))) {
          destroy_header = true;
        } else if (Utils::areEqual(name, name_len, TS_MIME_FIELD_CONTENT_LENGTH, TS_MIME_LEN_CONTENT_LENGTH)) {
          if (mod_data->head_only) {
            destroy_header = true;
            Dbg(dbg_ctl_local, "[%s] remove Content-Length", __FUNCTION__);
          }
        } else {
          int n_field_values = TSMimeHdrFieldValuesCount(bufp, hdr_loc, field_loc);
          for (int j = 0; j < n_field_values; ++j) {
            value = TSMimeHdrFieldValueStringGet(bufp, hdr_loc, field_loc, j, &value_len);
            if (nullptr == value || !value_len) {
              Dbg(dbg_ctl_local, "[%s] Error while getting value #%d of header [%.*s]", __FUNCTION__, j, name_len, name);
            } else {
              if (!mod_data->option_info->packed_node_support || mod_data->cache_txn) {
                bool response_cacheable, is_cache_header;
                is_cache_header = checkForCacheHeader(name, name_len, value, value_len, response_cacheable);
                if (is_cache_header && response_cacheable) {
                  destroy_header = true;
                }
              }