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* doc/wget.texi: Add description for --retry-on-http-error * src/http.c (gethttp): Consider given HTTP response codes as non-fatal, transient errors. Supply a comma-separated list of 3-digit HTTP response codes as argument. Useful to work around special circumstances where retries are required, but the server responds with an error code normally not retried by Wget. Such errors might be 503 (Service Unavailable) and 429 (Too Many Requests). Retries enabled by this option are performed subject to the normal retry timing and retry count limitations of Wget. Using this option is intended to support special use cases only and is generally not recommended, as it can force retries even in cases where the server is actually trying to decrease its load. Please use it wisely and only if you know what you are doing. Example use and a starting point for manual testing: wget --retry-on-http-error=429,503 http://httpbin.org/status/503