Function handleError

src/hovercard.js:1454–1539

(xhr)

          let isRetry = false
          let handleError = function(xhr) {
            let { status } = xhr
            let title = ''
            let message = ''

            switch (status) {
              case 0:
                if (isRetry) {
                  title = 'Connection error'
                  message = 'Please try again later.'
                } else {
                  // next request should be retry
                  isRetry = true
                  request()
                  return
                }
                break
              case 401:
                title = 'Invalid token'
                message = encodeHTML`<a href="${CREATE_TOKEN_PATH}" class="ghh-token-link" target="_blank">Create a new access token</a>, <a href="#" class="ghh-token-link">paste it back here</a> and try again.`
                break
              case 403: {
                let response = xhr.responseJSON
                if (
                  xhr
                    .getAllResponseHeaders()
                    .indexOf('X-RateLimit-Remaining: 0') !== -1
                ) {
                  title = 'API rate limit exceeded'
                  if (!localStorage.getItem(TOKEN_KEY)) {
                    message = encodeHTML`API rate limit exceeded for current IP. <a href="${CREATE_TOKEN_PATH}" class="ghh-token-link" target="_blank">Create a new access token</a> and <a href="#" class="ghh-token-link">paste it back here</a> to get a higher rate limit.`
                  }
                } else if (
                  type === EXTRACT_TYPE.REPO &&
                  response.block &&
                  response.block.reason === 'tos'
                ) {
                  title = 'Access blocked'
                  message = encodeHTML`Access to this repository has been disabled by GitHub staff.`
                } else {
                  title = 'Forbidden'
                  message = encodeHTML`You are not allowed to access GitHub API. <a href="${CREATE_TOKEN_PATH}" class="ghh-token-link" target="_blank">Create a new access token</a>, <a href="#" class="ghh-token-link">paste it back here</a> and try again.`
                }
                break
              }
              case 404:
                title = 'Not found'
                if (type === EXTRACT_TYPE.REPO || type === EXTRACT_TYPE.ISSUE) {
                  message = encodeHTML`The repository doesn't exist or is private. <a href="${CREATE_TOKEN_PATH}" class="ghh-token-link" target="_blank">Create a new access token</a>, <a href="#" class="ghh-token-link">paste it back here</a> and try again.`
                } else if (type === EXTRACT_TYPE.USER) {
                  message = "The user doesn't exist."
                }
                break
              case 451: {
                let response = xhr.responseJSON
                if (
                  type === EXTRACT_TYPE.REPO &&
                  response.block &&