val c = this[i]
    // The WHATWG Host parsing rules accepts some character codes which are invalid by
    // definition for OkHttp's host header checks (and the WHATWG Host syntax definition). Here
    // we rule out characters that would cause problems in host headers.
    if (c <= '\u001f' || c >= '\u007f') {
      return true
    }
    // Check for the characters mentioned in the WHATWG Host parsing spec:

    this because it only occurs if you have proxy configured and you share a connection pool among
    multiple `OkHttpClient` instances.

    This particularly-subtle bug was caused by us assigning each `OkHttpClient` instance its own
    `NullProxySelector` when an explicit proxy is configured. But we don't share connections when
    the proxy selectors are different. Ugh!

import org.junit.jupiter.api.extension.AfterEachCallback
import org.junit.jupiter.api.extension.BeforeEachCallback
import org.junit.jupiter.api.extension.ExtensionContext

/**
 * Apply this rule to all tests. It adds additional checks for leaked resources and uncaught
 * exceptions.
 *
 * Use [newClient] as a factory for a OkHttpClient instances. These instances are specifically
 * configured for testing.
 */

    val rule = findMatchingRule(domainLabels)
    if (domainLabels.size == rule.size && rule[0][0] != EXCEPTION_MARKER) {
      return null // The domain is a public suffix.
    }

    val firstLabelOffset =
      if (rule[0][0] == EXCEPTION_MARKER) {
        // Exception rules hold the effective TLD plus one.
        domainLabels.size - rule.size
      } else {

        buffer.write(source, length.toLong())
      }
    }
    while (!buffer.exhausted()) {
      var publicSuffix = buffer.readUtf8LineStrict()
      if (publicSuffix.contains("*")) {
        // A wildcard rule, let's replace the wildcard with a value.
        publicSuffix = publicSuffix.replace("\\*".toRegex(), "square")
      }
      assertThat(publicSuffixDatabase.getEffectiveTldPlusOne(publicSuffix)).isNull()