Apache Commons HttpClient
To do communication with non-trusted web applications or websites, extra care shall be taken while using the default credentials. Activation of the preemptive authentication is done, or for a specific authentication when credentials have not been given explicitly and default credentials would be used by the host HttpClient so that to get authentication with the targeted site.
To avoid giving the critical & sensitive credentials to some non-trustable website, you shall
Within HttpClient, preemptive authentication can be enabled. HttpClient sends the response of basic authentication before unauthorized is given by server, in preemptive authentication mode. This will be reducing overhead for connection making.
To enable it, use this code. Java Code: client.getParams().setAuthenticationPreemptive(true);
For preemptive authentication, default credentials are required to be set for proxy host or target. Preemptive authentication will
Exception types which might be encountered to a HttpClient when HTTP methods are executed, are as following:
1. protocol exceptions
2. transport exceptions
In regular use of the HttpClient, all these exceptions would not propagate to user. Internally handled exceptions by HttpClient have been marked as internal.
I. Transport exceptions
II. HTTP transport safety
III. Protocol exceptions
IV. Custom exception handler
Transparent mechanism is present in HttpClient for handling of the authentication. Login credentials are required for the development of application. In HttpState instance, login credentials are being stored.Use the setCredentials method to set these credentials.Use the getCredentials method to retrieve these credentials.
setDoAuthentication method is present in HttpMethod class. Automatic authorization is provided by it for the HttpClient. Changes
The HTTP i.e. Hyper Text Transfer Protocol is one of the most significant & popular protocol nowadays. HTTP protocolís role has been expanded by the network growth; web services and other network enable applications. Also, applications which need HTTP protocol are also increasing in number.
Core functionality is being provided by the java.net package to access resources through HTTP. Full functionality is not provided by this package which is needed by applications. Apache Commons