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---
title: "January, 2025"
date: 2025-01-03T11:09:00+03:00
author: "Alan Orth"
categories: ["Notes"]
---
## 2025-01-03
- Trying to get search results for a large boolean query given to me by some researchers
- When searching via the Angular frontend I see an error in the Tomcat logs:
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```
Jan 03 09:08:40 dspace tomcat9[876]: Jan 03, 2025 9:08:40 AM org.apache.coyote.http11.Http11Processor service
Jan 03 09:08:40 dspace tomcat9[876]: INFO: Error parsing HTTP request header
Jan 03 09:08:40 dspace tomcat9[876]: Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.
Jan 03 09:08:40 dspace tomcat9[876]: java.lang.IllegalArgumentException: Request header is too large
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:778)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.http11.Http11InputBuffer.parseHeader(Http11InputBuffer.java:892)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.http11.Http11InputBuffer.parseHeaders(Http11InputBuffer.java:593)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:279)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:937)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
Jan 03 09:08:40 dspace tomcat9[876]: at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
Jan 03 09:08:40 dspace tomcat9[876]: at java.base/java.lang.Thread.run(Thread.java:840)
```
- The size of the query itself is 5362 bytes
- Increasing the `maxHttpHeaderSize` from the default of 8192 bytes to 16384 allows the search to complete successfully
- I notice that we had previously increased the `maxHttpHeaderSize` on the HTTP connector in Tomcat 7, which we are no longer using in Tomcat 9, so this is an overdue change
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