# Body - Multiple Parameters { #body-multiple-parameters }

Now that we have seen how to use `Path` and `Query`, let's see more advanced uses of request body declarations.

## Mix `Path`, `Query` and body parameters { #mix-path-query-and-body-parameters }

First, of course, you can mix `Path`, `Query` and request body parameter declarations freely and **FastAPI** will know what to do.

        // Third: sb.length() > 0, add delimiter + "" (sb becomes "middle,")
        assertEquals("middle,", result);
    }

    @Test
    @DisplayName("Should handle mix of empty and null elements")
    void testJoinWithMixedEmptyAndNull() {
        String result = StringUtil.join("-", "", null, "value", "", null);
        // First: "" (sb becomes "")

		{"11 foo=bar\n\x00", "\x00", "foo", "bar", true},
		{"18 foo=b=\nar=\n==\x00\n", "", "foo", "b=\nar=\n==\x00", true},
		{"27 foo=hello9 foo=ba\nworld\n", "", "foo", "hello9 foo=ba\nworld", true},
		{"27 ☺☻☹=日a本b語ç\nmeow mix", "meow mix", "☺☻☹", "日a本b語ç", true},
		{"17 \x00hello=\x00world\n", "17 \x00hello=\x00world\n", "", "", false},
		{"1 k=1\n", "1 k=1\n", "", "", false},
		{"6 k~1\n", "6 k~1\n", "", "", false},

        assertEquals(1, param.getValues().length);
        assertEquals("onlyValue", param.getValues()[0]);
    }

    public void test_constructor_withNullAndNonNullValues() {
        // Test with mix of null and non-null values
        String name = "mixedParam";
        String[] values = { "value1", null, "value3", null };
        RequestParameter param = new RequestParameter(name, values);

			Owner:  owners[i%len(owners)],
			Group:  true,
			Quorum: 3,
		}
		lris = append(lris, lri)
		locksHeld[resource] = []lockRequesterInfo{lri}
	}

	// Add a few concurrent read locks to the mix
	for i := range 50 {
		resource := fmt.Sprintf("bucket/get-object-%d", i)
		lri := lockRequesterInfo{
			Name:   resource,
			UID:    mustGetUUID(),
			Owner:  owners[i%len(owners)],
			Quorum: 2,
		}

            final int threadId = t;
            executor.submit(() -> {
                try {
                    for (int i = 0; i < operationsPerThread; i++) {
                        try {
                            // Mix of success and failure
                            final int iteration = i;
                            String result = circuitBreaker.executeWithCircuitBreaker(() -> {

 * {@code String} and a {@code String} to a {@code long} that treat the {@code long} as an unsigned
 * number.
 *
 * <p>Users of these utilities must be <i>extremely careful</i> not to mix up signed and unsigned
 * {@code long} values. When possible, it is recommended that the {@link UnsignedLong} wrapper class
 * be used, at a small efficiency penalty, to enforce the distinction in the type system.
 *

                    failureUrl.setId("E" + i);
                    failureUrl.setUrl("http://test.com/" + i + ".html");
                    failureUrl.setErrorCount(i + 1);
                    // Mix different error names
                    if (i == 0) {
                        failureUrl.setErrorName("java.net.ConnectException");
                    } else if (i == 1) {

Чтобы это понять, представьте такую картину:

### Конкурентные бургеры

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 *
 * Every [edit] call must be matched by a call to [Editor.commit] or [Editor.abort]. Committing is
 * atomic: a read observes the full set of values as they were before or after the commit, but never
 * a mix of values.
 *
 * Clients call [get] to read a snapshot of an entry. The read will observe the value at the time
 * that [get] was called. Updates and removals after the call do not impact ongoing reads.
 *