Check if URL exists

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Ryan
Ryan 2012-7-30
编辑： Walter Roberson 2017-4-26
Does anyone know how to check if a URL exists? The function exist seems to only work of file paths through a computer.

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回答（1 个）

Walter Roberson
Walter Roberson 2012-7-30
It is possible to detect that a URL does exist, but it is not always possible to detect that a URL does not exist compared to it existing but you not being permitted to examine it.
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Edward Strobach
Edward Strobach 2017-4-25
@Walter, that first response was deep
Edward Strobach
Edward Strobach 2017-4-26
编辑：Walter Roberson 2017-4-26
I found for files online, that I can create a function that examines, iteratively, the presence of a file within a URL to determine whether or not it exists.
Example
function [info,status] = FileExists(t)
t = num2str(8965);
url = strcat('http://podaac-opendap.jpl.nasa.gov/opendap/allData/oscar/preview/L4/oscar_third_deg/oscar_vel',t,'.nc.gz');[~,status] = urlread(url);
filename = strcat('oscar_vel',t,'.nc.gz');
try
Info = ncinfo(url);
status = 1;
catch
Info = [];
status = 0;
end
If status is 1, then file exists, if status is 0, the file doesnt' exist. You can use a tilde for the first output within the square brackets to suppress the output if you only want to look at the status

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