Extension(index): Extension<Arc<Index>>,
    Path(height): Path<u32>,
  ) -> ServerResult<String> {
    Ok(
      index
        .block_hash(Some(height))?
        .ok_or_not_found(|| "blockhash")?
        .to_string(),
    )
  }

  async fn block_hash_from_height_json(
    Extension(index): Extension<Arc<Index>>,
    Path(height): Path<u32>,
  ) -> ServerResult<Json<String>> {
    Ok(Json(
      index
        .block_hash(Some(height))?
        .ok_or_not_found(|| "blockhash")?
        .to_string(),
    ))
  }

  async fn block_time(Extension(index): Extension<Arc<Index>>) -> ServerResult<String> {
    Ok(
      index
        .block_time(index.block_height()?.ok_or_not_found(|| "blocktime")?)?
        .unix_timestamp()
        .to_string(),
    )
  }

  async fn input(
    Extension(page_config): Extension<Arc<PageConfig>>,
    Extension(index): Extension<Arc<Index>>,
    Path(path): Path<(u32, usize, usize)>,
  ) -> Result<PageHtml<InputHtml>, ServerError> {
    let not_found = || format!("input /{}/{}/{}", path.0, path.1, path.2);