AppModule.java

//  Here is how I use it in my AppModule.java, note there may be no any HTTP Request when this code executing:

import xxx.web.pages.oauth.Callback;

// ...

    @Contribute(OAuthServiceCatalog.class)
    public void contributeOAuthServices(MappedConfiguration<String, OAuthServiceConfig> configuration,
            // ...
            OfflineLinkSource offlineLinkSource)
    {
        //  ...
        Link callback = offlineLinkSource.createPageRenderLink(Callback.class);
        callback.addParameter(Button.SERVICE, XXX_EXTERNAL_SYSTEM);
        
        String uri = callback.toAbsoluteURI();
        // ...

OfflineLinkSource.java

package com.anjlab.tapestry5.services;

import org.apache.tapestry5.Link;
import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.internal.services.LinkImpl;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.ioc.annotations.Symbol;
import org.apache.tapestry5.services.BaseURLSource;
import org.apache.tapestry5.services.ComponentClassResolver;

public class OfflineLinkSource
{
    public static final String SERVICE_ID = "OfflineLinkSource";

    private @Inject @Symbol(SymbolConstants.SECURE_ENABLED) boolean secureEnabled;
    
    private @Inject BaseURLSource baseURLSource;
    
    private @Inject ComponentClassResolver resolver;
    
    public Link createPageRenderLink(final String pageName)
    {
        return new LinkImpl("/", false, null, null, null, null)
        {
            @Override
            public String toAbsoluteURI()
            {
                StringBuilder builder = new StringBuilder(baseURLSource.getBaseURL(secureEnabled))
                    .append('/')
                    .append(resolver.canonicalizePageName(pageName).toLowerCase());
                
                String sep = "?";

                for (String name : getParameterNames())
                {
                    String[] values = getParameterValues(name);

                    for (String value : values)
                    {
                        builder.append(sep);

                        // We assume that the name is URL safe and that the value will already have been URL
                        // encoded if it is not known to be URL safe.

                        builder.append(name);
                        builder.append("=");
                        builder.append(value);

                        sep = "&";
                    }
                }
                
                return builder.toString();
            }
        };
    }

    public Link createPageRenderLink(Class<?> pageClass)
    {
        return createPageRenderLink(resolver.resolvePageClassNameToPageName(pageClass.getName()));
    }
}