/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License.
*/ package org.apache.coyote.http2;
/* * This test uses small window updates and data frames that will trigger the excessive overhead protection so * disable it.
*/
http2Protocol.setOverheadWindowUpdateThreshold(0);
http2Protocol.setOverheadDataThreshold(0);
// Default connection window size is 64k - 1. Initial request will have used 8k (56k -1). Increase it to 57k.
sendWindowUpdate(0, 1 + 1024);
// Consume 56k of the connection window for (int i = 3; i < 17; i += 2) {
sendSimpleGetRequest(i);
readSimpleGetResponse();
}
// At this point the connection window should be 1k
// Process a request on stream 17. This should consume the connection window.
sendSimpleGetRequest(17); // 17-headers, 17-1k-body
parser.readFrame();
parser.readFrame();
trace = output.getTrace();
System.out.println(trace);
output.clearTrace();
// Send additional requests. Connection window is empty so only headers will be returned.
sendSimpleGetRequest(19);
sendSimpleGetRequest(21);
// At this point 17, 19 and 21 are all blocked because the connection window is zero. // 17 - 7k body left // 19 - 8k body left // 21 - 8k body left
// Add 1k to the connection window. Should be used for stream 17.
sendWindowUpdate(0, 1024);
parser.readFrame(); Assert.assertEquals("17-Body-1024\n", output.getTrace());
output.clearTrace();
// 17 - 6k body left // 19 - 8k body left // 21 - 8k body left
// Re-order the priorities
sendPriorityUpdate(19, 2, false);
sendPriorityUpdate(21, 1, false);
// Add 1k to the connection window. Should be used for stream 21.
sendWindowUpdate(0, 1024);
parser.readFrame();
// Add 3k to the connection window. Should be split between 17, 19 and 21.
sendWindowUpdate(0, 1024 * 3);
parser.readFrame();
parser.readFrame();
parser.readFrame();
// 1 byte unallocated in connection window // 17 - 5267 body left // 19 - 7022 body left // 21 - 6144 body left
// Add 1 byte to the connection window. Due to rounding up, each stream should get 1 byte.
sendWindowUpdate(0, 1);
parser.readFrame();
parser.readFrame();
parser.readFrame();
// 1 byte over allocated in connection window // 17 - 5266 body left // 19 - 7021 body left // 21 - 6143 body left
// Re-order the priorities
sendPriorityUpdate(17, 2, true);
/* * Add 8k to the connection window. Should clear the connection window over allocation and fully allocate 17 * with the remainder split equally between 17 and 21.
*/
sendWindowUpdate(0, 1024 * 8); // Use try/catch as third read has been failing on some tests runs try {
parser.readFrame();
parser.readFrame();
parser.readFrame();
} catch (IOException ioe) { // Dump for debugging purposes
ioe.printStackTrace(); // Continue - we'll get trace dumped to stdout below
}
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