Allow RtspHeaders to take multiple header values under the same name.

Some RTSP servers will offer multiple WWW-Authenticate options. We wanted to be able to pick them up. #minor-release PiperOrigin-RevId: 375907276
2026-03-27 09:45:47 +00:00 · 2021-05-26 11:36:23 +01:00 · 2021-05-26 11:36:23 +01:00 · 088ad91017
commit 088ad91017
parent 99d3773eb9
5 changed files with 215 additions and 131 deletions
--- a/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspHeaders.java
+++ b/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspHeaders.java
@ -20,9 +20,8 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.util.Util;
 import com.google.common.base.Ascii;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap;
-import java.util.ArrayList;
-import java.util.LinkedHashMap;
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.Iterables;
 import java.util.List;
 import java.util.Map;

@ -35,45 +34,45 @@ import java.util.Map;
 */
 /* package */ final class RtspHeaders {

-  public static final String ACCEPT = "Accept";
-  public static final String ALLOW = "Allow";
-  public static final String AUTHORIZATION = "Authorization";
-  public static final String BANDWIDTH = "Bandwidth";
-  public static final String BLOCKSIZE = "Blocksize";
-  public static final String CACHE_CONTROL = "Cache-Control";
-  public static final String CONNECTION = "Connection";
-  public static final String CONTENT_BASE = "Content-Base";
-  public static final String CONTENT_ENCODING = "Content-Encoding";
-  public static final String CONTENT_LANGUAGE = "Content-Language";
-  public static final String CONTENT_LENGTH = "Content-Length";
-  public static final String CONTENT_LOCATION = "Content-Location";
-  public static final String CONTENT_TYPE = "Content-Type";
-  public static final String CSEQ = "CSeq";
-  public static final String DATE = "Date";
-  public static final String EXPIRES = "Expires";
-  public static final String PROXY_AUTHENTICATE = "Proxy-Authenticate";
-  public static final String PROXY_REQUIRE = "Proxy-Require";
-  public static final String PUBLIC = "Public";
-  public static final String RANGE = "Range";
-  public static final String RTP_INFO = "RTP-Info";
-  public static final String RTCP_INTERVAL = "RTCP-Interval";
-  public static final String SCALE = "Scale";
-  public static final String SESSION = "Session";
-  public static final String SPEED = "Speed";
-  public static final String SUPPORTED = "Supported";
-  public static final String TIMESTAMP = "Timestamp";
-  public static final String TRANSPORT = "Transport";
-  public static final String USER_AGENT = "User-Agent";
-  public static final String VIA = "Via";
-  public static final String WWW_AUTHENTICATE = "WWW-Authenticate";
+  public static final String ACCEPT = "accept";
+  public static final String ALLOW = "allow";
+  public static final String AUTHORIZATION = "authorization";
+  public static final String BANDWIDTH = "bandwidth";
+  public static final String BLOCKSIZE = "blocksize";
+  public static final String CACHE_CONTROL = "cache-control";
+  public static final String CONNECTION = "connection";
+  public static final String CONTENT_BASE = "content-base";
+  public static final String CONTENT_ENCODING = "content-encoding";
+  public static final String CONTENT_LANGUAGE = "content-language";
+  public static final String CONTENT_LENGTH = "content-length";
+  public static final String CONTENT_LOCATION = "content-location";
+  public static final String CONTENT_TYPE = "content-type";
+  public static final String CSEQ = "cseq";
+  public static final String DATE = "date";
+  public static final String EXPIRES = "expires";
+  public static final String PROXY_AUTHENTICATE = "proxy-authenticate";
+  public static final String PROXY_REQUIRE = "proxy-require";
+  public static final String PUBLIC = "public";
+  public static final String RANGE = "range";
+  public static final String RTP_INFO = "rtp-info";
+  public static final String RTCP_INTERVAL = "rtcp-interval";
+  public static final String SCALE = "scale";
+  public static final String SESSION = "session";
+  public static final String SPEED = "speed";
+  public static final String SUPPORTED = "supported";
+  public static final String TIMESTAMP = "timestamp";
+  public static final String TRANSPORT = "transport";
+  public static final String USER_AGENT = "user-agent";
+  public static final String VIA = "via";
+  public static final String WWW_AUTHENTICATE = "www-authenticate";

  /** Builds {@link RtspHeaders} instances. */
  public static final class Builder {
-    private final List<String> namesAndValues;
+    private final ImmutableListMultimap.Builder<String, String> namesAndValuesBuilder;

    /** Creates a new instance. */
    public Builder() {
-      namesAndValues = new ArrayList<>();
+      namesAndValuesBuilder = new ImmutableListMultimap.Builder<>();
    }

    /**
@ -84,8 +83,7 @@ import java.util.Map;
     * @return This builder.
     */
    public Builder add(String headerName, String headerValue) {
-      namesAndValues.add(headerName.trim());
-      namesAndValues.add(headerValue.trim());
+      namesAndValuesBuilder.put(Ascii.toLowerCase(headerName.trim()), headerValue.trim());
      return this;
    }

@ -130,37 +128,38 @@ import java.util.Map;
    }
  }

-  private final ImmutableList<String> namesAndValues;
+  private final ImmutableListMultimap<String, String> namesAndValues;

  /**
-   * Gets the headers as a map, where the keys are the header names and values are the header
-   * values.
-   *
-   * @return The headers as a map. The keys of the map have follows those that are used to build
-   *     this {@link RtspHeaders} instance.
+   * Returns a map that associates header names to the list of values associated with the
+   * corresponding header name.
   */
-  public ImmutableMap<String, String> asMap() {
-    Map<String, String> headers = new LinkedHashMap<>();
-    for (int i = 0; i < namesAndValues.size(); i += 2) {
-      headers.put(namesAndValues.get(i), namesAndValues.get(i + 1));
-    }
-    return ImmutableMap.copyOf(headers);
+  public ImmutableListMultimap<String, String> asMultiMap() {
+    return namesAndValues;
  }

  /**
-   * Returns a header value mapped to the argument, {@code null} if the header name is not recorded.
+   * Returns the most recent header value mapped to the argument, {@code null} if the header name is
+   * not recorded.
   */
  @Nullable
  public String get(String headerName) {
-    for (int i = namesAndValues.size() - 2; i >= 0; i -= 2) {
-      if (Ascii.equalsIgnoreCase(headerName, namesAndValues.get(i))) {
-        return namesAndValues.get(i + 1);
-      }
+    ImmutableList<String> headerValues = values(headerName);
+    if (headerValues.isEmpty()) {
+      return null;
    }
-    return null;
+    return Iterables.getLast(headerValues);
+  }
+
+  /**
+   * Returns a list of header values mapped to the argument, in the addition order. The returned
+   * list is empty if the header name is not recorded.
+   */
+  public ImmutableList<String> values(String headerName) {
+    return namesAndValues.get(Ascii.toLowerCase(headerName));
  }

  private RtspHeaders(Builder builder) {
-    this.namesAndValues = ImmutableList.copyOf(builder.namesAndValues);
+    this.namesAndValues = builder.namesAndValuesBuilder.build();
  }
 }
--- a/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtil.java
+++ b/library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtil.java
@ -39,7 +39,7 @@ import com.google.android.exoplayer2.ParserException;
 import com.google.android.exoplayer2.util.Util;
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableListMultimap;
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@ -94,11 +94,13 @@ import java.util.regex.Pattern;
    builder.add(
        Util.formatInvariant(
            "%s %s %s", toMethodString(request.method), request.uri, RTSP_VERSION));
-    ImmutableMap<String, String> headers = request.headers.asMap();
+
+    ImmutableListMultimap<String, String> headers = request.headers.asMultiMap();
    for (String headerName : headers.keySet()) {
-      builder.add(
-          Util.formatInvariant(
-              "%s: %s", headerName, checkNotNull(request.headers.get(headerName))));
+      ImmutableList<String> headerValuesForName = headers.get(headerName);
+      for (int i = 0; i < headerValuesForName.size(); i++) {
+        builder.add(Util.formatInvariant("%s: %s", headerName, headerValuesForName.get(i)));
+      }
    }
    // Empty line after headers.
    builder.add("");
@ -119,11 +121,12 @@ import java.util.regex.Pattern;
        Util.formatInvariant(
            "%s %s %s", RTSP_VERSION, response.status, getRtspStatusReasonPhrase(response.status)));

-    ImmutableMap<String, String> headers = response.headers.asMap();
+    ImmutableListMultimap<String, String> headers = response.headers.asMultiMap();
    for (String headerName : headers.keySet()) {
-      builder.add(
-          Util.formatInvariant(
-              "%s: %s", headerName, checkNotNull(response.headers.get(headerName))));
+      ImmutableList<String> headerValuesForName = headers.get(headerName);
+      for (int i = 0; i < headerValuesForName.size(); i++) {
+        builder.add(Util.formatInvariant("%s: %s", headerName, headerValuesForName.get(i)));
+      }
    }
    // Empty line after headers.
    builder.add("");
--- a/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspHeadersTest.java
+++ b/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspHeadersTest.java
@ -20,6 +20,7 @@ import static com.google.common.truth.Truth.assertThat;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ListMultimap;
 import org.junit.Test;
 import org.junit.runner.RunWith;

@ -82,7 +83,47 @@ public final class RtspHeadersTest {
  }

  @Test
-  public void asMap() {
+  public void get_withMultipleValuesMappedToTheSameName_getsTheMostRecentValue() {
+    RtspHeaders headers =
+        new RtspHeaders.Builder()
+            .addAll(
+                ImmutableList.of(
+                    "WWW-Authenticate: Digest realm=\"2857be52f47f\","
+                        + " nonce=\"f4cba07ad14b5bf181ac77c5a92ba65f\", stale=\"FALSE\"",
+                    "WWW-Authenticate: Basic realm=\"2857be52f47f\""))
+            .build();
+
+    assertThat(headers.get("WWW-Authenticate")).isEqualTo("Basic realm=\"2857be52f47f\"");
+  }
+
+  @Test
+  public void values_withNoHeaders_returnsAnEmptyList() {
+    RtspHeaders headers = new RtspHeaders.Builder().build();
+
+    assertThat(headers.values("WWW-Authenticate")).isEmpty();
+  }
+
+  @Test
+  public void values_withMultipleValuesMappedToTheSameName_returnsAllMappedValues() {
+    RtspHeaders headers =
+        new RtspHeaders.Builder()
+            .addAll(
+                ImmutableList.of(
+                    "WWW-Authenticate: Digest realm=\"2857be52f47f\","
+                        + " nonce=\"f4cba07ad14b5bf181ac77c5a92ba65f\", stale=\"FALSE\"",
+                    "WWW-Authenticate: Basic realm=\"2857be52f47f\""))
+            .build();
+
+    assertThat(headers.values("WWW-Authenticate"))
+        .containsExactly(
+            "Digest realm=\"2857be52f47f\", nonce=\"f4cba07ad14b5bf181ac77c5a92ba65f\","
+                + " stale=\"FALSE\"",
+            "Basic realm=\"2857be52f47f\"")
+        .inOrder();
+  }
+
+  @Test
+  public void asMultiMap_withoutValuesMappedToTheSameName_getsTheMappedValuesInAdditionOrder() {
    RtspHeaders headers =
        new RtspHeaders.Builder()
            .addAll(
@ -92,11 +133,39 @@ public final class RtspHeadersTest {
                    "Content-Length: 707",
                    "Transport: RTP/AVP;unicast;client_port=65458-65459\r\n"))
            .build();
-    assertThat(headers.asMap())
+    assertThat(headers.asMultiMap())
        .containsExactly(
-            "Accept", "application/sdp",
-            "CSeq", "3",
-            "Content-Length", "707",
-            "Transport", "RTP/AVP;unicast;client_port=65458-65459");
+            "accept", "application/sdp",
+            "cseq", "3",
+            "content-length", "707",
+            "transport", "RTP/AVP;unicast;client_port=65458-65459");
+  }
+
+  @Test
+  public void asMap_withMultipleValuesMappedToTheSameName_getsTheMappedValuesInAdditionOrder() {
+    RtspHeaders headers =
+        new RtspHeaders.Builder()
+            .addAll(
+                ImmutableList.of(
+                    "Accept: application/sdp ", // Extra space after header value.
+                    "Accept: application/sip ", // Extra space after header value.
+                    "CSeq:3", // No space after colon.
+                    "CSeq:5", // No space after colon.
+                    "Transport: RTP/AVP;unicast;client_port=65456-65457",
+                    "Transport: RTP/AVP;unicast;client_port=65458-65459\r\n"))
+            .build();
+    ListMultimap<String, String> headersMap = headers.asMultiMap();
+
+    assertThat(headersMap.keySet()).containsExactly("accept", "cseq", "transport").inOrder();
+    assertThat(headersMap)
+        .valuesForKey("accept")
+        .containsExactly("application/sdp", "application/sip")
+        .inOrder();
+    assertThat(headersMap).valuesForKey("cseq").containsExactly("3", "5").inOrder();
+    assertThat(headersMap)
+        .valuesForKey("transport")
+        .containsExactly(
+            "RTP/AVP;unicast;client_port=65456-65457", "RTP/AVP;unicast;client_port=65458-65459")
+        .inOrder();
  }
 }
--- a/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspMessageChannelTest.java
+++ b/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspMessageChannelTest.java
@ -141,18 +141,18 @@ public final class RtspMessageChannelTest {
    assertThat(receivedRtspResponses)
        .containsExactly(
            /* optionsResponse */
-            ImmutableList.of("RTSP/1.0 200 OK", "CSeq: 2", "Public: OPTIONS", ""),
+            ImmutableList.of("RTSP/1.0 200 OK", "cseq: 2", "public: OPTIONS", ""),
            /* describeResponse */
            ImmutableList.of(
                "RTSP/1.0 200 OK",
-                "CSeq: 3",
-                "Content-Type: application/sdp",
-                "Content-Length: 28",
+                "cseq: 3",
+                "content-type: application/sdp",
+                "content-length: 28",
                "",
                "v=安卓アンドロイド"),
            /* setupResponse */
            ImmutableList.of(
-                "RTSP/1.0 200 OK", "CSeq: 3", "Transport: RTP/AVP/TCP;unicast;interleaved=0-1", ""))
+                "RTSP/1.0 200 OK", "cseq: 3", "transport: RTP/AVP/TCP;unicast;interleaved=0-1", ""))
        .inOrder();
    assertThat(receivedInterleavedData)
        .containsExactly(
--- a/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtilTest.java
+++ b/library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspMessageUtilTest.java
@ -21,6 +21,7 @@ import static com.google.common.truth.Truth.assertThat;
 import android.net.Uri;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ListMultimap;
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Test;
@ -41,8 +42,10 @@ public final class RtspMessageUtilTest {
    RtspRequest request = RtspMessageUtil.parseRequest(requestLines);

    assertThat(request.method).isEqualTo(RtspRequest.METHOD_OPTIONS);
-    assertThat(request.headers.asMap())
-        .containsExactly(RtspHeaders.CSEQ, "2", RtspHeaders.USER_AGENT, "LibVLC/3.0.11");
+    assertThat(request.headers.asMultiMap())
+        .containsExactly(
+            RtspHeaders.CSEQ, "2",
+            RtspHeaders.USER_AGENT, "LibVLC/3.0.11");
    assertThat(request.messageBody).isEmpty();
  }

@ -57,12 +60,12 @@ public final class RtspMessageUtilTest {
    RtspResponse response = RtspMessageUtil.parseResponse(responseLines);

    assertThat(response.status).isEqualTo(200);
-    assertThat(response.headers.asMap())
+    assertThat(response.headers.asMultiMap())
        .containsExactly(
            RtspHeaders.CSEQ,
            "2",
            RtspHeaders.PUBLIC,
-            "OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, GET_PARAMETER, SET_PARAMETER");
+            "OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, GET_PARAMETER," + " SET_PARAMETER");
    assertThat(response.messageBody).isEmpty();
  }

@ -78,14 +81,11 @@ public final class RtspMessageUtilTest {
    RtspRequest request = RtspMessageUtil.parseRequest(requestLines);

    assertThat(request.method).isEqualTo(RtspRequest.METHOD_DESCRIBE);
-    assertThat(request.headers.asMap())
+    assertThat(request.headers.asMultiMap())
        .containsExactly(
-            RtspHeaders.CSEQ,
-            "3",
-            RtspHeaders.USER_AGENT,
-            "LibVLC/3.0.11",
-            RtspHeaders.ACCEPT,
-            "application/sdp");
+            RtspHeaders.CSEQ, "3",
+            RtspHeaders.USER_AGENT, "LibVLC/3.0.11",
+            RtspHeaders.ACCEPT, "application/sdp");
    assertThat(request.messageBody).isEmpty();
  }

@ -111,16 +111,12 @@ public final class RtspMessageUtilTest {
    RtspResponse response = RtspMessageUtil.parseResponse(responseLines);

    assertThat(response.status).isEqualTo(200);
-    assertThat(response.headers.asMap())
+    assertThat(response.headers.asMultiMap())
        .containsExactly(
-            RtspHeaders.CSEQ,
-            "3",
-            RtspHeaders.CONTENT_BASE,
-            "rtsp://127.0.0.1/test.mkv/",
-            RtspHeaders.CONTENT_TYPE,
-            "application/sdp",
-            RtspHeaders.CONTENT_LENGTH,
-            "707");
+            RtspHeaders.CSEQ, "3",
+            RtspHeaders.CONTENT_BASE, "rtsp://127.0.0.1/test.mkv/",
+            RtspHeaders.CONTENT_TYPE, "application/sdp",
+            RtspHeaders.CONTENT_LENGTH, "707");

    assertThat(response.messageBody)
        .isEqualTo(
@ -135,6 +131,30 @@ public final class RtspMessageUtilTest {
                + "a=control:track2");
  }

+  @Test
+  public void parseResponse_with401DescribeResponse_succeeds() {
+    List<String> responseLines =
+        Arrays.asList(
+            "RTSP/1.0 401 Unauthorized",
+            "CSeq: 3",
+            "WWW-Authenticate: BASIC realm=\"wow\"",
+            "WWW-Authenticate: DIGEST realm=\"wow\", nonce=\"nonce\"",
+            "");
+    RtspResponse response = RtspMessageUtil.parseResponse(responseLines);
+    ListMultimap<String, String> headersMap = response.headers.asMultiMap();
+
+    assertThat(response.status).isEqualTo(401);
+
+    assertThat(headersMap.keySet()).containsExactly("cseq", "www-authenticate").inOrder();
+    assertThat(headersMap).valuesForKey("cseq").containsExactly("3");
+    assertThat(headersMap)
+        .valuesForKey("www-authenticate")
+        .containsExactly("BASIC realm=\"wow\"", "DIGEST realm=\"wow\", nonce=\"nonce\"")
+        .inOrder();
+
+    assertThat(response.messageBody).isEmpty();
+  }
+
  @Test
  public void parseRequest_withSetParameterRequest_succeeds() {
    List<String> requestLines =
@ -149,16 +169,12 @@ public final class RtspMessageUtilTest {
    RtspRequest request = RtspMessageUtil.parseRequest(requestLines);

    assertThat(request.method).isEqualTo(RtspRequest.METHOD_SET_PARAMETER);
-    assertThat(request.headers.asMap())
+    assertThat(request.headers.asMultiMap())
        .containsExactly(
-            RtspHeaders.CSEQ,
-            "3",
-            RtspHeaders.USER_AGENT,
-            "LibVLC/3.0.11",
-            RtspHeaders.CONTENT_LENGTH,
-            "20",
-            RtspHeaders.CONTENT_TYPE,
-            "text/parameters");
+            RtspHeaders.CSEQ, "3",
+            RtspHeaders.USER_AGENT, "LibVLC/3.0.11",
+            RtspHeaders.CONTENT_LENGTH, "20",
+            RtspHeaders.CONTENT_TYPE, "text/parameters");
    assertThat(request.messageBody).isEqualTo("param: stuff");
  }

@ -176,14 +192,11 @@ public final class RtspMessageUtilTest {
    RtspResponse response = RtspMessageUtil.parseResponse(responseLines);

    assertThat(response.status).isEqualTo(200);
-    assertThat(response.headers.asMap())
+    assertThat(response.headers.asMultiMap())
        .containsExactly(
-            RtspHeaders.CSEQ,
-            "431",
-            RtspHeaders.CONTENT_LENGTH,
-            "46",
-            RtspHeaders.CONTENT_TYPE,
-            "text/parameters");
+            RtspHeaders.CSEQ, "431",
+            RtspHeaders.CONTENT_LENGTH, "46",
+            RtspHeaders.CONTENT_TYPE, "text/parameters");

    assertThat(response.messageBody).isEqualTo("packets_received: 10\r\n" + "jitter: 0.3838");
  }
@ -206,14 +219,14 @@ public final class RtspMessageUtilTest {
    List<String> expectedLines =
        Arrays.asList(
            "SETUP rtsp://127.0.0.1/test.mkv/track1 RTSP/1.0",
-            "CSeq: 4",
-            "Transport: RTP/AVP;unicast;client_port=65458-65459",
+            "cseq: 4",
+            "transport: RTP/AVP;unicast;client_port=65458-65459",
            "",
            "");
    String expectedRtspMessage =
        "SETUP rtsp://127.0.0.1/test.mkv/track1 RTSP/1.0\r\n"
-            + "CSeq: 4\r\n"
-            + "Transport: RTP/AVP;unicast;client_port=65458-65459\r\n"
+            + "cseq: 4\r\n"
+            + "transport: RTP/AVP;unicast;client_port=65458-65459\r\n"
            + "\r\n";

    assertThat(messageLines).isEqualTo(expectedLines);
@ -240,14 +253,14 @@ public final class RtspMessageUtilTest {
    List<String> expectedLines =
        Arrays.asList(
            "RTSP/1.0 200 OK",
-            "CSeq: 4",
-            "Transport: RTP/AVP;unicast;client_port=65458-65459;server_port=5354-5355",
+            "cseq: 4",
+            "transport: RTP/AVP;unicast;client_port=65458-65459;server_port=5354-5355",
            "",
            "");
    String expectedRtspMessage =
        "RTSP/1.0 200 OK\r\n"
-            + "CSeq: 4\r\n"
-            + "Transport: RTP/AVP;unicast;client_port=65458-65459;server_port=5354-5355\r\n"
+            + "cseq: 4\r\n"
+            + "transport: RTP/AVP;unicast;client_port=65458-65459;server_port=5354-5355\r\n"
            + "\r\n";
    assertThat(messageLines).isEqualTo(expectedLines);
    assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))
@ -282,10 +295,10 @@ public final class RtspMessageUtilTest {
    List<String> expectedLines =
        Arrays.asList(
            "RTSP/1.0 200 OK",
-            "CSeq: 4",
-            "Content-Base: rtsp://127.0.0.1/test.mkv/",
-            "Content-Type: application/sdp",
-            "Content-Length: 707",
+            "cseq: 4",
+            "content-base: rtsp://127.0.0.1/test.mkv/",
+            "content-type: application/sdp",
+            "content-length: 707",
            "",
            "v=0\r\n"
                + "o=- 1606776316530225 1 IN IP4 192.168.2.176\r\n"
@ -299,10 +312,10 @@ public final class RtspMessageUtilTest {

    String expectedRtspMessage =
        "RTSP/1.0 200 OK\r\n"
-            + "CSeq: 4\r\n"
-            + "Content-Base: rtsp://127.0.0.1/test.mkv/\r\n"
-            + "Content-Type: application/sdp\r\n"
-            + "Content-Length: 707\r\n"
+            + "cseq: 4\r\n"
+            + "content-base: rtsp://127.0.0.1/test.mkv/\r\n"
+            + "content-type: application/sdp\r\n"
+            + "content-length: 707\r\n"
            + "\r\n"
            + "v=0\r\n"
            + "o=- 1606776316530225 1 IN IP4 192.168.2.176\r\n"
@ -328,8 +341,8 @@ public final class RtspMessageUtilTest {
            /* messageBody= */ "");
    List<String> messageLines = RtspMessageUtil.serializeResponse(response);

-    List<String> expectedLines = Arrays.asList("RTSP/1.0 454 Session Not Found", "CSeq: 4", "", "");
-    String expectedRtspMessage = "RTSP/1.0 454 Session Not Found\r\n" + "CSeq: 4\r\n" + "\r\n";
+    List<String> expectedLines = Arrays.asList("RTSP/1.0 454 Session Not Found", "cseq: 4", "", "");
+    String expectedRtspMessage = "RTSP/1.0 454 Session Not Found\r\n" + "cseq: 4\r\n" + "\r\n";

    assertThat(RtspMessageUtil.serializeResponse(response)).isEqualTo(expectedLines);
    assertThat(RtspMessageUtil.convertMessageToByteArray(messageLines))