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The disadvantage of using GET is the limitation on URI length If the entry IDs are UUIDs or something similar, each ID will use 36 characters While these types of IDs are not common in normal Rails applications, UUIDs are used very often in distributed systems In fact, the vote system should probably not enforce that an entry ID be an integer It should be up to the entry system to decide whether it will use integer or string IDs URI length limits vary, depending on clients, servers, and proxies that exist between them Browsers often have the strictest limitations on URI length Internet Explorer has a limit of around 2 KB, while Firefox has a limit of 65 KB However, these service APIs will be used by other libraries and not in a browser address bar, so the GET request can be used with larger limits For the purposes of Ruby services, it makes sense to look at the settings for the two most popular web servers: Nginx and Apache Nginx has a default URI length limit that depends on the platform it is built on It is either 4 KB for 32-bit systems or 8 KB for 64-bit systems The default setting can be increased through the large_client_header_buffers setting (see http://wikinginxorg/ NginxHttpCoreModule#large_client_header_buffers) Apache has a default URI length of 8190 bytes This default can be increased through the LimitRequestLine directive (see http://httpdapacheorg/docs/22/mod/corehtml#limitrequestline) The potential limitations are worth keeping in mind if the API is expected to handle many IDs in a single request The API should be able to return the vote values for a single entry and for a single entry and user (in addition to the multi-get versions) Instead of implementing separate calls for the single gets, the multi-get interface can be reused The request will simply have a list containing only one ID, and the response will have a list of results with only one element Limiting the total number of endpoints in an API will make it easier to program against, test, and modify Responses for an API should follow a predictable convention There are many different ways to return responses to multi-get requests One response format could return a JSON array of objects where the order is the same as the IDs requested The other option is to return a JSON hash with the ID as a key and the response as a value The latter option is a little more verbose, but it s more explicit and easier to handle in the client code.

The General Tab Use the General tab to add to the user object additional identi cation information, such as a description, an of ce location, telephone numbers, an e-mail address, and Web pages The Address Tab Use the Address tab to con gure a physical address for the user, including street address, post of ce box, city, state, zip/postal code, and country region The Account Tab The Account tab is the tab you probably use the most In addition to allowing the user logon name to be modi ed, as shown in Figure 12-26, it provides the options Logon Hours and Log On To

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FIGURE 12-26 Spend time in this dialog for users in the domain Clicking the Logon Hours button opens up a dialog that shows every hour for each day of the week, and by default it has all hours available for logon However, you can select hours during which you deny logon for the user This is useful if you want to restrict when an account can be used Perhaps the user is a shift worker who should not be allowed to log on outside his shift hours By default, if a user is already logged on and the time changes to when logon is not permitted, he is not logged out but simply blocked from logging on again However, you can use group policy to force the logoff via Computer Configuration, Windows Settings, Security Settings, Local Policies, Security Options, Network security: Force logoff When Logon Hours Expire Click the Log On To button to limit a user to logging on to a de ned set of machines identi ed by DNS or NetBIOS name One of the security features of Windows is that if a user account fails a logon attempt a con gurable number of times, the user account is locked out This is designed to prevent the account from being hacked by an

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