NEW YORK — Stocks are rushing higher worldwide, and oil prices are easing Wednesday as hopes build that the war with Iran could end soon. That’s even though some of the signals investors saw as hopeful are already under dispute, and several prior bouts of optimism in financial markets quickly got undercut by continued, fierce fighting in the war.

The S&P 500 rallied 0.9% and added to its leap from the day before, which was its best since last spring. That followed even bigger gains for stock markets across Europe and Asia, including an 8.4% surge in South Korea, which were catching up to Wall Street’s rally from Tuesday.

The Dow Jones Industrial Average was up 294 points, or 0.6%, as of 2:08 p.m. Eastern time, and the Nasdaq…