func initCommonHeader() {
	commonHeader = make(map[string]string)
	for _, v := range []string{
		"Accept",
		"Accept-Charset",
		"Accept-Encoding",
		"Accept-Language",
		"Accept-Ranges",
		"Cache-Control",
		"Cc",
		"Connection",
		"Content-Id",
		"Content-Language",
		"Content-Length",
		"Content-Transfer-Encoding",
		"Content-Type",
		"Cookie",
		"Date",

// WriteAt should not affect nor be affected by the underlying
// seek offset.
//
// Clients of WriteAt can execute parallel WriteAt calls on the same
// destination if the ranges do not overlap.
//
// Implementations must not retain p.
type WriterAt interface {
	WriteAt(p []byte, off int64) (n int, err error)
}

// ByteReader is the interface that wraps the ReadByte method.
//

  // C++11 Standard.  Note that nondigit is defined as [_a-zA-Z] and digit is
  // defined as [0-9].
  //
  // Technically the standard also allows for `universal-character-name`, with a
  // table of allowed unicode ranges, as well as `other implementation-defined
  // characters`.  We disallow those here to give better error messages, at the
  // expensive of being more restrictive than the standard.
  if (ident[0] != '_' && !IsAlpha(ident[0])) {

                    <ul id="declaring-dependency-versions">
                        <li><a href="../userguide/single_versions.html">Declaring Versions and Ranges</a></li>
                        <li><a href="../userguide/rich_versions.html">Declaring Rich Versions</a></li>
                        <li><a href="../userguide/dynamic_versions.html">Handling Changing Versions</a></li>

	// describe, so they should only be treated as a best-effort annotation.
	EventStackSample

	// EventRangeBegin and EventRangeEnd are a pair of generic events representing
	// a special range of time. Ranges are named and scoped to some resource
	// (identified via ResourceKind). A range that has begun but has not ended
	// is considered active.
	//
	// EvRangeBegin and EvRangeEnd will share the same name, and an End will always

  }

  /**
   * This test attempts to cause a future to wait for longer than it was requested to from a timed
   * get() call. As measurements of time are prone to flakiness, it tries to assert based on ranges
   * derived from observing how much time actually passed for various operations.
   */
  @SuppressWarnings({"DeprecatedThreadMethods", "ThreadPriorityCheck"})
  @AndroidIncompatible // Thread.suspend

			if m.Start <= a && a < m.Limit {
				l.Mapping = m
				continue nextLocation
			}
		}
		// Work around legacy handlers failing to encode the first
		// part of mappings split into adjacent ranges.
		for _, m := range p.Mapping {
			if m.Offset != 0 && m.Start-m.Offset <= a && a < m.Start {
				m.Start -= m.Offset
				m.Offset = 0
				l.Mapping = m
				continue nextLocation
			}
		}

  if (!qtype || !qtype.isSigned()) return {};

  const int num_bits = qtype.getStorageTypeIntegralWidth();
  // This is a negative value, and will be applied on zero points and fixed
  // point ranges.
  const int64_t offset =
      QType::getDefaultMinimumForInteger(/*isSigned=*/true, num_bits) -
      QType::getDefaultMinimumForInteger(/*isSigned=*/false, num_bits);

      num_bits =
          static_cast<int>(std::ceil(std::log2(qtype.getStorageTypeMax())));
    }
    // This is a positive value, and will be applied on zero points and fixed
    // point ranges.
    int64_t offset =
        QType::getDefaultMinimumForInteger(/*isSigned=*/false, num_bits) -
        QType::getDefaultMinimumForInteger(/*isSigned=*/true, num_bits);

  }

  /**
   * This test attempts to cause a future to wait for longer than it was requested to from a timed
   * get() call. As measurements of time are prone to flakiness, it tries to assert based on ranges
   * derived from observing how much time actually passed for various operations.
   */
  @SuppressWarnings({"DeprecatedThreadMethods", "ThreadPriorityCheck"})
  @AndroidIncompatible // Thread.suspend