What is URL redirection?  Web HTTP 

What is ETag header and how it works?  Web HTTP 

How 'Last-Modified' and 'If-Modified-Since' headers work?  Web HTTP 

HTTP Header  Web HTTP 

Idempotent Operation  HTTP Programming 

Concurrency and Multithreading  Programming Software Engineering 

SOAP  Web Services SOAP 

Web Service  Web Services REST SOAP 

HTTP Message  Web HTTP 

Software Performance  Software Engineering Programming 

Big O Notation  Software Engineering Programming Java Collections 

Data Structure  Software Engineering Programming Java Collections 

Abstract Data Type  Software Engineering Programming Java Collections 

Algorithm  Software Engineering Programming Java Collections 

Mutable vs Immutable Objects  Java 

HTTP Cookie  HTTP 

application/x-www-form-urlencoded  HTTP HTML 

multipart/form-data  Web HTTP HTML 

Bean Validation  JavaBean Validation JAVA EE 

Failover  Server Software 

HTTP Session  HTTP 

SOAP vs REST  Web Services REST SOAP 

Java Compile time constants  Java 

javap  Java 

Blank final variable  Java 

JVM Options  Java JVM Options 

JIT  Java JVM Options 

URL encoding  Web 

URI Template  Web 

MIME Type  Web HTTP 

JVM Ergonomics  Java 

jps  Java 

jmap  Java 

Query String  Web 

MVC  Software Engineering Design Pattern 

HTTP Request Methods  Web HTTP 

HTTP  Web HTTP 

HTML Form  HTML 

HATEOAS  Software Engineering REST 

Communication Protocol  Web Communication Protocol HTTP 

Content Negotiation  HTTP Web 

ASCII Control characters  Web 

ASCII  Web 

JConsole  Java