Apache Tomcat 10 Configuration Reference

This must be org.apache.coyote.http2.Http2Protocol.

Controls the initial size of the flow control window for streams that Tomcat advertises to clients. If not specified, the default value of 65535 is used.

The time, in milliseconds, that Tomcat will wait between HTTP/2 frames when there is no active Stream before closing the connection. Negative values will be treated as an infinite timeout. If not specified, a default value of 20000 will be used.

The controls the maximum number of streams for any one connection that can be allocated threads from the container thread pool. If more streams are active than threads are available, those streams will have to wait for a stream to become available. If not specified, the default value of 20 will be used.

The controls the maximum number of active streams permitted for any one connection. If a client attempts to open more active streams than this limit, the stream will be reset with a STREAM_REFUSED error. If not specified, the default value of 100 will be used.

The maximum number of headers in a request that is allowed by the container. A request that contains more headers than the specified limit will be rejected. A value of less than 0 means no limit. If not specified, a default of 100 is used.

The maximum number of trailer headers in a request that is allowed by the container. A request that contains more trailer headers than the specified limit will be rejected. A value of less than 0 means no limit. If not specified, a default of 100 is used.

The threshold below which the payload size of a non-final CONTINUATION frame will trigger an increase in the overhead count (see overheadCountFactor). The overhead count will be increased by overheadContinuationThreshold/payloadSize so that the smaller the CONTINUATION frame, the greater the increase in the overhead count. A value of zero or less disables the checking of non-final CONTINUATION frames. If not specified, a default value of 1024 will be used.

The factor to apply when counting overhead frames to determine if a connection has too high an overhead and should be closed. The overhead count starts at -10 * overheadCountFactor. The count is decreased by 20 for each data frame sent or received and each headers frame received. The count is increased by the overheadCountFactor for each setting, priority, priority update and ping frame received. If the overhead count exceeds zero, the connection is closed. A value of less than 1 disables this protection. In normal usage a value of approximately 20 or higher will close the connection before any streams can complete. If not specified, a default value of 10 will be used.

The amount by which the overhead count (see overheadCountFactor) will be increased for each reset frame received. If not specified, a default value of 50 will be used. A value of less than zero will be treated as zero.

The threshold below which the average payload size of the current and previous non-final DATA frames will trigger an increase in the overhead count (see overheadCountFactor). The overhead count will be increased by overheadDataThreshold/average so that the smaller the average, the greater the increase in the overhead count. A value of zero or less disables the checking of non-final DATA frames. If not specified, a default value of 1024 will be used.

The threshold below which the average size of current and previous WINDOW_UPDATE frame will trigger an increase in the overhead count (see overheadCountFactor). The overhead count will be increased by overheadWindowUpdateThreshold/average so that the smaller the average, the greater the increase in the overhead count. A value of zero or less disables the checking of WINDOW_UPDATE frames. If not specified, a default value of 1024 will be used.

The time, in milliseconds, that Tomcat will wait for additional data when a partial HTTP/2 frame has been received. Negative values will be treated as an infinite timeout. If not specified, a default value of 5000 will be used.

The time, in milliseconds, that Tomcat will wait for additional data frames to arrive for the stream when an application is performing a blocking I/O read and additional data is required. Negative values will be treated as an infinite timeout. If not specified, a default value of 20000 will be used.

The time, in milliseconds, that Tomcat will wait for additional window update frames to arrive for the stream and/or connection when an application is performing a blocking I/O write and the stream and/or connection flow control window is too small for the write to complete. Negative values will be treated as an infinite timeout. If not specified, a default value of 20000 will be used.

Use this boolean attribute to enable or disable sendfile capability. The default value is true.

This setting is ignored, and the sendfile capability disabled, if the useAsyncIO attribute of the associated Connector is set to false.

The HTTP/2 sendfile capability uses MappedByteBuffer which is known to cause file locking on Windows.

The time, in milliseconds, that Tomcat will wait to write additional data when an HTTP/2 frame has been partially written. Negative values will be treated as an infinite timeout. If not specified, a default value of 5000 will be used.