Robuta

https://www.ibm.com/support/pages/node/6958522
IBM HTTP Server, which is used by IBM WebSphere Application Server, is vulnerable to a denial of service using a specially crafted URL. This has been addressed...
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https://www.ibm.com/support/pages/node/5695167
Security scans may report HTTP header injection issues against Information Server.
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https://w3techs.com/technologies/compselect/ws-cherokee,ws-ibmhttp
web servers market shares, alternatives to IBM HTTP Server and Cherokee
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