```

#### `RequestValidationError` vs `ValidationError` { #requestvalidationerror-vs-validationerror }

/// warning

These are technical details that you might skip if it's not important for you now.

///

		var key, val []byte
		key, buf, e = msgp.ReadMapKeyZC(buf)
		if e != nil {
			return nil, e
		}
		if len(key) == 0 {
			return nil, fmt.Errorf("xlMetaInlineData: key %d is length 0", i)
		}
		// Skip data...
		val, buf, e = msgp.ReadBytesZC(buf)
		if e != nil {
			return nil, e
		}
		if i > 0 {
			res = append(res, ',')
		}
		s := fmt.Sprintf(`"%s":%d`, string(key), len(val))

    }

    // Test reload with invalid format
    public void test_reload_invalidFormat() throws Exception {
        writeTestFile("a,b => c\ninvalid_line\nd,e => f\n");

        // Should skip invalid line
        PagingList<CharMappingItem> result = charMappingFile.selectList(0, 10);
        assertEquals(2, result.size());
    }

    // Test reload with missing arrow

			continue
		}
		if tokenRevokeType != "" {
			claims, err := getClaimsFromTokenWithSecret(ui.Credentials.SessionToken, secret)
			if err != nil {
				continue // skip if token is invalid
			}
			// skip if token type is given and does not match
			if v, _ := claims.Lookup(tokenRevokeTypeClaim); v != tokenRevokeType {
				continue
			}
		}

            while ((list = csvReader.readValues()) != null) {
                final String suggestWord = getValue(list, 0);
                if (StringUtil.isBlank(suggestWord)) {
                    // skip
                    continue;
                }
                try {
                    final String[] permissions = split(getValue(list, 2), ",").get(stream -> stream.map(permissionHelper::encode)

 *  New: Update to h2-14 and hpack-9.
 *  New: OkHttp includes a user-agent by default, like `okhttp/2.1.0-RC1`.
 *  Fix: Handle response code `308 Permanent Redirect`.
 *  Fix: Don't skip the callback if a call is canceled.
 *  Fix: Permit hostnames with underscores.
 *  Fix: Permit overriding the content-type in `OkApacheClient`.
 *  Fix: Use the socket factory for direct connections.

			z.BucketTargetsConfigMetaUpdatedAt, err = dc.ReadTime()
			if err != nil {
				err = msgp.WrapError(err, "BucketTargetsConfigMetaUpdatedAt")
				return
			}
		default:
			err = dc.Skip()
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z *BucketMetadata) EncodeMsg(en *msgp.Writer) (err error) {

	// If etcd backend is specified and etcd server is not present, the test
	// is skipped.
	etcdServer := env.Get(EnvTestEtcdBackend, "")
	if s.withEtcdBackend && etcdServer == "" {
		c.Skip("Skipping etcd backend IAM test as no etcd server is configured.")
	}

	s.TestSuiteCommon.SetUpSuite(c)

	s.iamSetup(c)

	if s.withEtcdBackend {
		s.setUpEtcd(c, etcdServer)
	}
}

///

### Understand that Code { #understand-that-code }

The important point is just using **`AfterValidator` with a function inside `Annotated`**. Feel free to skip this part. 🤸

---

But if you're curious about this specific code example and you're still entertained, here are some extra details.

#### String with `value.startswith()` { #string-with-value-startswith }

In this case, you can disable the response model generation by setting `response_model=None`:

{* ../../docs_src/response_model/tutorial003_05_py310.py hl[7] *}

This will make FastAPI skip the response model generation and that way you can have any return type annotations you need without it affecting your FastAPI application. 🤓

## Response Model encoding parameters { #response-model-encoding-parameters }