Function normalize_accept_encoding

plugins/compress/misc.cc:80–132

} // end anonymous namespace

void
normalize_accept_encoding(TSHttpTxn /* txnp ATS_UNUSED */, TSMBuffer reqp, TSMLoc hdr_loc)
{
  TSMLoc field   = TSMimeHdrFieldFind(reqp, hdr_loc, TS_MIME_FIELD_ACCEPT_ENCODING, TS_MIME_LEN_ACCEPT_ENCODING);
  bool   deflate = false;
  bool   gzip    = false;
  bool   br      = false;
  // remove the accept encoding field(s),
  // while finding out if gzip or deflate is supported.
  while (field) {
    int         val_len;
    const char *values_ = TSMimeHdrFieldValueStringGet(reqp, hdr_loc, field, -1, &val_len);
    if (values_ && val_len) {
      swoc::TextView values(values_, val_len);
      while (values) {
        swoc::TextView next{values.take_prefix_at(',')};
        strip_ae_value(next);
        if (strcasecmp("gzip", next) == 0) {
          gzip = true;
        } else if (strcasecmp("br", next) == 0) {
          br = true;
        } else if (strcasecmp("deflate", next) == 0) {
          deflate = true;
        }
      }
    }

    TSMLoc tmp = TSMimeHdrFieldNextDup(reqp, hdr_loc, field);
    TSMimeHdrFieldDestroy(reqp, hdr_loc, field); // catch retval?
    TSHandleMLocRelease(reqp, hdr_loc, field);
    field = tmp;
  }

  // append a new accept-encoding field in the header
  if (deflate || gzip || br) {
    TSMimeHdrFieldCreate(reqp, hdr_loc, &field);
    TSMimeHdrFieldNameSet(reqp, hdr_loc, field, TS_MIME_FIELD_ACCEPT_ENCODING, TS_MIME_LEN_ACCEPT_ENCODING);
    if (br) {
      TSMimeHdrFieldValueStringInsert(reqp, hdr_loc, field, -1, "br", strlen("br"));
      info("normalized accept encoding to br");
    }
    if (gzip) {
      TSMimeHdrFieldValueStringInsert(reqp, hdr_loc, field, -1, "gzip", strlen("gzip"));
      info("normalized accept encoding to gzip");
    } else if (deflate) {
      TSMimeHdrFieldValueStringInsert(reqp, hdr_loc, field, -1, "deflate", strlen("deflate"));
      info("normalized accept encoding to deflate");
    }

    TSMimeHdrFieldAppend(reqp, hdr_loc, field);
    TSHandleMLocRelease(reqp, hdr_loc, field);
  }
}

void
hide_accept_encoding(TSHttpTxn /* txnp ATS_UNUSED */, TSMBuffer reqp, TSMLoc hdr_loc, const char *hidden_header_name)