```Python hl_lines="9"
{!../../docs_src/query_params/tutorial001.py!}
```

The query is the set of key-value pairs that go after the `?` in a URL, separated by `&` characters.

For example, in the URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

...the query parameters are:

* `skip`: with a value of `0`
* `limit`: with a value of `10`

As they are part of the URL, they are "naturally" strings.

        @SuppressWarnings("unchecked")
        K castKey = (K) key;
        V value = getIfPresent(key);
        if (value != null) {
          result.put(castKey, value);
        }
      }
    }
    return ImmutableMap.copyOf(result);
  }

  /** @since 11.0 */
  @Override
  public void put(K key, V value) {
    throw new UnsupportedOperationException();
  }

  /** @since 12.0 */
  @Override

                        "value": "Listeners"
                     }
                  ]
               },
               {
                  "matcher": {
                     "id": "byName",
                     "options": "rds"
                  },
                  "properties": [
                     {
                        "id": "displayName",
                        "value": "Routes"
                     }

        ch.qos.logback.classic.Level value;
        switch (level) {
            case DEBUG:
                value = ch.qos.logback.classic.Level.DEBUG;
                break;

            case INFO:
                value = ch.qos.logback.classic.Level.INFO;
                break;

            default:
                value = ch.qos.logback.classic.Level.ERROR;
                break;
        }

  }

  /** Returns the hash prefix given the current mask. */
  static int getHashPrefix(int value, int mask) {
    return value & ~mask;
  }

  /** Returns the index, or 0 if the entry is "null". */
  static int getNext(int entry, int mask) {
    return entry & mask;
  }

  /** Returns a new value combining the prefix and suffix using the given mask. */
  static int maskCombine(int prefix, int suffix, int mask) {

    notifyAndClearListeners();
  }

  @CanIgnoreReturnValue
  protected boolean set(V value) {
    if (!state.permitsPublicUserToTransitionTo(State.VALUE)) {
      return false;
    }

    forceSet(value);
    return true;
  }

  private void forceSet(V value) {
    this.value = value;
    this.state = State.VALUE;
    notifyAndClearListeners();
  }

  @CanIgnoreReturnValue

    for (long value : UNSIGNED_INTS) {
      assertThat(UnsignedInts.toLong(UnsignedInts.checkedCast(value))).isEqualTo(value);
    }
    assertCastFails(1L << 32);
    assertCastFails(-1L);
    assertCastFails(Long.MAX_VALUE);
    assertCastFails(Long.MIN_VALUE);
  }

  private static void assertCastFails(long value) {
    try {
      UnsignedInts.checkedCast(value);

  @Override
  @CheckForNull
  public V putIfAbsent(K key, V value) {
    return delegate().putIfAbsent(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean remove(@CheckForNull Object key, @CheckForNull Object value) {
    return delegate().remove(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public V replace(K key, V value) {
    return delegate().replace(key, value);
  }

	Key     string   `xml:"Key,omitempty" json:"Key,omitempty"`
	Value   string   `xml:"Value,omitempty" json:"Value,omitempty"`
}

var (
	errInvalidTagKey   = Errorf("The TagKey you have provided is invalid")
	errInvalidTagValue = Errorf("The TagValue you have provided is invalid")
)

func (tag Tag) String() string {
	return tag.Key + "=" + tag.Value
}

// IsEmpty returns whether this tag is empty or not.

                  "properties": [
                     {
                        "id": "custom.axisPlacement",
                        "value": "right"
                     },
                     {
                        "id": "unit",
                        "value": "c/s"
                     }
                  ]
               }
            ]
         },
         "gridPos": {
            "h": 10,