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We analyze the off-shell scattering amplitudes in the framework of thelight-front perturbation theory. It is shown that the previously derivedrecursion relation between tree level off-shell amplitudes in this formalismactually resums whole classes of graphs into a Wilson line. More precisely, weestablish a correspondence between the light-front methods for the computationof the off-shell amplitudes and the approach which makes use of the matrixelements of straight infinite Wilson lines, which are manifestly gaugeinvariant objects. Furthermore, since it is needed to explicitly verify thegauge invariance of light-front amplitudes, it is demonstrated that the Wardidentities in this framework need additional instantaneous terms in thelight-front graphs.

Recursion relations for multi-gluon off-shell amplitudes on the light-front and Wilson lines