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02: HTTP basics on headers, MIME types, & cookies for Java developers

Q1. What happens when you open up a browser and type a URL to request a Web page or RESTFul web service data? A1. HTTP is a stateless protocol on top of TCP (Transmission Control Protocol). 1) When the IP address is obtained, … Read more ›...



Chrome Postman to test and debug RESTful Web Services

Step 1 You need to get the Postman extension for the Google chrome browser.

Step 2 Search and add POSTMAN.

Step 3 Once installed, open it from the Apps link.

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Step 4 Set the TEST URL,

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Debugging connection refused issues in Java with 9 tips

Possible reasons for “refused connections” 1) Client & Server are not connected by the LAN. For example, they can be in the different zones. 2) The Server might not be running. 3) The server might be listening on a different port or the server might have not started properly as...



Debugging java.security.cert.CertificateException: Certificates do not conform to algorithm constraints

Why? You may have a certificate with SHA1RSA key size less than 1024 bits or you have a certificate in your chain that uses MD2RSA.

Explanation? MD2 was widely recognized as insecure and thus disabled in Java in version JDK 7 onwards.

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Debugging SSL issues in Java & tools to debug

Q1. What are some of the issues you encounter with SSL handshake? A1. Some of the issues you try to debug are Presence of a valid certificate in trust store Incorrect certificate chains in the client or server truststore Invalid key algorithm used for private keys Expired certificate Incorrect passwords...



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