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lihan pushed a commit to branch 9.0.x
in repository

The following commit(s) were added to refs/heads/9.0.x by this push:
     new 70d776a391 Note that maxHttpHeaderSize always allocates the max size
70d776a391 is described below

commit 70d776a39105f6a8fcd0c14f376472c155bbe001
Author: Jordan Christiansen <>
AuthorDate: Wed Oct 12 14:08:40 2022 -0500

    Note that maxHttpHeaderSize always allocates the max size
 webapps/docs/config/http.xml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/webapps/docs/config/http.xml b/webapps/docs/config/http.xml
index 8f5501044d..019e859796 100644
--- a/webapps/docs/config/http.xml
+++ b/webapps/docs/config/http.xml
@@ -531,6 +531,11 @@
       the request line, header names and header values. If not specified, this
       attribute is set to the value of the <code>maxHttpHeaderSize</code>
+      <p>If you see "Request header is too large" errors you can increase this,
+      but be aware that Tomcat will allocate the full amount you specify for
+      every request. For example, if you specify a maxHttpRequestHeaderSize of
+      1 MB and your application handles 100 concurrent requests, you will see
+      100 MB of heap consumed by request headers.</p>
     <attribute name="maxHttpResponseHeaderSize" required="false">

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