<img src="/img/tutorial/custom-response/image01.png">

## Available responses

Here are some of the available responses.

Keep in mind that you can use `Response` to return anything else, or even create a custom sub-class.

/// note | "Technical Details"

You could also use `from starlette.responses import HTMLResponse`.

      char c1 = seq.charAt(index++);
      if (c1 < Character.MIN_HIGH_SURROGATE || c1 > Character.MAX_LOW_SURROGATE) {
        // Fast path (first test is probably all we need to do)
        return c1;
      } else if (c1 <= Character.MAX_HIGH_SURROGATE) {
        // If the high surrogate was the last character, return its inverse
        if (index == end) {
          return -c1;
        }

    if (values instanceof Collection) {
      Collection<? extends V> valueCollection = (Collection<? extends V>) values;
      return !valueCollection.isEmpty() && get(key).addAll(valueCollection);
    } else {
      Iterator<? extends V> valueItr = values.iterator();
      return valueItr.hasNext() && Iterators.addAll(get(key), valueItr);
    }
  }

  @CanIgnoreReturnValue
  @Override

        if (ind1 == -1 || ind2 == -1) {
            return;
        }

        this.groupId = name.substring(0, ind1);
        if (ind1 == ind2) {
            this.artifactId = name.substring(ind1 + 1);
        } else {
            this.artifactId = name.substring(ind1 + 1, ind2);
            this.version = name.substring(ind2 + 1);
        }
    }

    public ArtifactMetadata(String groupId, String name, String version) {

                                // here groupId and artifactId cannot be null
                                return new PluginInfo(groupId, artifactId, goalPrefix, name);
                            } else {
                                logger.warn(
                                        "Artifact {}:{}"
                                                + " JAR (about to be installed/deployed) contains Maven Plugin metadata for"

			req.Header.Set(xRealIP, clientIP)
		}
	}

	xfProto := req.Header.Get(xForwardedProto)
	if xfProto == "" {
		if req.TLS != nil {
			req.Header.Set(xForwardedProto, "https")
		} else {
			req.Header.Set(xForwardedProto, "http")
		}
	}

	if xfPort := req.Header.Get(xForwardedPort); xfPort == "" {
		req.Header.Set(xForwardedPort, forwardedPort(req))
	}

  /**
   * Returns a mutable view of the underlying bytes for the given {@code HashCode} if it is a
   * byte-based hashcode. Otherwise it returns {@link HashCode#asBytes}. Do <i>not</i> mutate this
   * array or else you will break the immutability contract of {@code HashCode}.
   */
  byte[] getBytesInternal() {
    return asBytes();
  }

  /**

    return Maps.immutableEntry(key, value);
  }

  private void assertMapSize(Map<?, ?> map, int size) {
    assertEquals(size, map.size());
    if (size > 0) {
      assertFalse(map.isEmpty());
    } else {
      assertTrue(map.isEmpty());
    }
    assertCollectionSize(map.keySet(), size);
    assertCollectionSize(map.entrySet(), size);
    assertCollectionSize(map.values(), size);
  }

      }
      return Files.asByteSink(file);
    }

    @Override
    public byte[] getExpected(byte[] bytes) {
      if (initialBytes == null) {
        return checkNotNull(bytes);
      } else {
        byte[] result = new byte[initialBytes.length + bytes.length];
        System.arraycopy(initialBytes, 0, result, 0, initialBytes.length);
        System.arraycopy(bytes, 0, result, initialBytes.length, bytes.length);

	}
	logIf(ctx, subsystem, err)
}

func errToEntry(ctx context.Context, subsystem string, err error, errKind ...interface{}) log.Entry {
	var l string
	if anonFlag {
		l = reflect.TypeOf(err).String()
	} else {
		l = fmt.Sprintf("%v (%T)", err, err)
	}
	return buildLogEntry(ctx, subsystem, l, getTrace(3), errKind...)
}

func logToEntry(ctx context.Context, subsystem, message string, errKind ...interface{}) log.Entry {