```

因为上述数据未包含已存储的属性 `"tax": 20.2`，新的输入模型会把 `"tax": 10.5` 作为默认值。

因此，本次操作把 `tax` 的值「更新」为 `10.5`。

## 用 `PATCH` 进行部分更新

<a href="https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Methods/PATCH" class="external-link" target="_blank">HTTP `PATCH`</a> 操作用于更新 *部分* 数据。

即，只发送要更新的数据，其余数据保持不变。

/// note | "笔记"

`PATCH` 没有 `PUT` 知名，也怎么不常用。

很多人甚至只用 `PUT` 实现部分更新。

**FastAPI** 对此没有任何限制，可以**随意**互换使用这两种操作。

                } catch (final Exception e1) {
                    logger.warn("Failed to create bucket: {}", fessConfig.getStorageBucket(), e1);
                }
            } else if (logger.isDebugEnabled()) {
                logger.debug("Failed to access {}", fessConfig.getStorageEndpoint(), e);
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {

d=4===a.length||7===a.length;if(d){var e=/[0-9a-f]/i,f=a.slice(1).split(""),g=!0;return f.forEach(function(a){null===a.match(e)&&(g=!1)}),g}return!1},errorMessage:"",errorMessageKey:"badHex"}),a.formUtils.addValidator({name:"rgb",validatorFunction:function(a,b){if("true"===b.valAttr("allow-transparent")&&"transparent"===a)return!0;var c=a.replace(/ /g,""),d=/\([0-9]{1,3},[0-9]{1,3},[0-9]{1,3}\)/i;if(c.match(d)){var e=c.replace(/\(/g,"").replace(/\)/g,""),f=e.split(","),g=!0;return f.forEach(function(a){var b=p...

                    response.setHeader("Content-Type", responseContentType);
                }
                CopyUtil.copy(in, out);
            } catch (final ClientAbortException e) {
                logger.debug("Client aborts this request.", e);
            }
        } catch (final Exception e) {
            if (!(e.getCause() instanceof ClientAbortException)) {

        }
        catch ( NoSuchAlgorithmException e ) {
            throw new CIFSUnsupportedCryptoException(e);
        }
    }


    /**
     * 
     * @return MD5 digest
     */
    public static MessageDigest getMD5 () {
        try {
            return MessageDigest.getInstance("MD5");
        }
        catch ( NoSuchAlgorithmException e ) {

      "virtual_hosts": [
       {
        "name": "backend",
        "domains": [
         "*"
        ],
        "routes": [
         {
          "match": {
           "prefix": "/stats/prometheus"
          },
          "route": {
           "cluster": "prometheus_stats"
          }
         }
        ]
       }
      ]
     },

   * constructor.
   */
  public void testAddEqualObjectWithOArgConstructor() {
    equalsTester.addEqualityGroup(equalObject1, notEqualObject1);
    try {
      equalsTester.testEquals();
    } catch (AssertionFailedError e) {
      assertErrorMessage(
          e,
          equalObject1
              + " [group 1, item 1] must be Object#equals to "
              + notEqualObject1
              + " [group 1, item 2]");

    } catch (UnsupportedOperationException expected) {
    }
  }

  private void assertSetCountDecreasingFailure(E element, int count) {
    try {
      setCountNoCheckReturnValue(element, count);
      fail("a call to multiset.setCount() to decrease an element's count should throw");
    } catch (UnsupportedOperationException expected) {
    }
  }

func (rulesMap RulesMap) MatchSimple(eventName Name, objectName string) bool {
	return rulesMap[eventName].MatchSimple(objectName)
}

// Match - returns TargetIDSet matching object name and event name in rules map.
func (rulesMap RulesMap) Match(eventName Name, objectName string) TargetIDSet {
	return rulesMap[eventName].Match(objectName)
}

// NewRulesMap - creates new rules map with given values.

                try {
                    zos.write(data.getBytes(Constants.CHARSET_UTF_8));
                } catch (final IOException e) {
                    logger.warn("Failed to access /{}/{}.", index, hit.getId(), e);
                }
                return true;
            });
        } catch (final IOException e) {
            logger.warn("Failed to access /{}.", index, e);
        }
    }