* See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.io.IOException
import java.util.concurrent.TimeUnit

/**
 * Observes, modifies, and potentially short-circuits requests going out and the corresponding
 * responses coming back in. Typically interceptors add, remove, or transform headers on the request
 * or response.
 *

        .clearHeaders()
        .code(HttpURLConnection.HTTP_NOT_MODIFIED)
        .addHeader("Content-Encoding: gzip")
        .build(),
    )
    server.enqueue(
      MockResponse(body = "b"),
    )
    val response1 = getResponse(newRequest("/"))
    assertThat(response1.code).isEqualTo(HttpURLConnection.HTTP_NOT_MODIFIED)
    assertContent("", response1)

        MockResponse.Builder()
          .addHeader("Last-Modified: $lastModifiedDate")
          .addHeader("Date: " + formatDate(-15, TimeUnit.SECONDS))
          .build(),
      )
    assertThat(conditionalRequest.headers["If-Modified-Since"])
      .isEqualTo(lastModifiedDate)
  }

  @Test
  fun defaultExpirationDateFullyCachedForMoreThan24Hours() {
    //      last modified: 105 days ago
    //             served:   5 days ago

          conditionValue = etag
        }

        lastModified != null -> {
          conditionName = "If-Modified-Since"
          conditionValue = lastModifiedString
        }

        servedDate != null -> {
          conditionName = "If-Modified-Since"
          conditionValue = servedDateString
        }

02B6          ; mapped                 ; 0281          # 1.1  MODIFIER LETTER SMALL CAPITAL INVERTED R
02B7          ; mapped                 ; 0077          # 1.1  MODIFIER LETTER SMALL W
02B8          ; mapped                 ; 0079          # 1.1  MODIFIER LETTER SMALL Y
02B9..02C1    ; valid                                  # 1.1  MODIFIER LETTER PRIME..MODIFIER LETTER REVERSED GLOTTAL STOP

  }

  @Test
  fun headerSplitWithDate() {
    val request =
      fromArgs(
        "-H",
        "If-Modified-Since: Mon, 18 Aug 2014 15:16:06 GMT",
        "http://example.com",
      ).createRequest()
    assertThat(request.header("If-Modified-Since")).isEqualTo(
      "Mon, 18 Aug 2014 15:16:06 GMT",
    )
  }

  companion object {
    fun fromArgs(vararg args: String): Main {

      Header("expires", ""),
      Header("from", ""),
      Header("host", ""),
      Header("if-match", ""),
      Header("if-modified-since", ""),
      Header("if-none-match", ""),
      Header("if-range", ""),
      Header("if-unmodified-since", ""),
      Header("last-modified", ""),
      Header("link", ""),
      Header("location", ""),
      Header("max-forwards", ""),
      Header("proxy-authenticate", ""),

      meet the following conditions:

      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and

 * limitations under the License.
 */
@file:JvmName("HttpHeaders")

package okhttp3.internal.http

import java.io.EOFException
import java.net.HttpURLConnection.HTTP_NOT_MODIFIED
import java.net.HttpURLConnection.HTTP_NO_CONTENT
import java.util.Collections
import okhttp3.Challenge
import okhttp3.Cookie
import okhttp3.CookieJar
import okhttp3.Headers
import okhttp3.HttpUrl

          ?: throw ProtocolException(
            "Unexpected status line: $statusLine",
          )

      // Parse an optional response message like "OK" or "Not Modified". If it
      // exists, it is separated from the response code by a space.
      var message = ""
      if (statusLine.length > codeStart + 3) {
        if (statusLine[codeStart + 3] != ' ') {