): String? = headers[name] ?: defaultValue

@Throws(IOException::class)
fun Response.commonPeekBody(byteCount: Long): ResponseBody {
  val peeked = body.source().peek()
  val buffer = Buffer()
  peeked.request(byteCount)
  buffer.write(peeked, minOf(byteCount, peeked.buffer.size))
  return buffer.asResponseBody(body.contentType(), buffer.size)
}

fun Response.commonNewBuilder(): Response.Builder = Response.Builder(this)

      hasPeeked = false;
      peekedElement = null;
      return result;
    }

    @Override
    public void remove() {
      checkState(!hasPeeked, "Can't remove after you've peeked at next");
      iterator.remove();
    }

    @Override
    @ParametricNullness
    public E peek() {
      if (!hasPeeked) {
        peekedElement = iterator.next();

        )
    }
    add(FirErrors.CANNOT_WEAKEN_ACCESS_PRIVILEGE) { firDiagnostic ->
        CannotWeakenAccessPrivilegeImpl(
            firDiagnostic.a,
            firSymbolBuilder.callableBuilder.buildCallableSymbol(firDiagnostic.b),
            firDiagnostic.c,
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.CANNOT_WEAKEN_ACCESS_PRIVILEGE_WARNING) { firDiagnostic ->