Download files from https server using username and password

2021 8 12
2 个回答
回答已采纳
更新时间：2023 6 28
9 次查看（30 天）

1 个投票

url = 'https://cddis.nasa.gov/archive/gnss/products/0971/';
In this https server, I need to download "cod09710.eph.Z" file for a specific location in my computer. How I can download this file using username and password related to this https server?

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 采纳的回答

Rik
Rik 2021-8-12
Ran in:

2 个投票

Ran in:
You should be able to use websave. You can provide a username and password in weboptions:
weboptions
ans =
weboptions with properties: CharacterEncoding: 'auto' UserAgent: 'MATLAB 9.10.0.1716447 (R2021a) Update 4' Timeout: 5 Username: '' Password: '' KeyName: '' KeyValue: '' ContentType: 'auto' ContentReader: [] MediaType: 'auto' RequestMethod: 'auto' ArrayFormat: 'csv' HeaderFields: [] CertificateFilename: 'default'

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sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear @Rik, I created the weboptions as follows:
options = weboptions('Username','name','Password','mypassword');
After defining username and passw, could you show the next step?
Rik
Rik 2021-8-12
I haven't tried myself, but this should work:
filename='';
url='';
name='name';
mypassword='mypassword';
options = weboptions('Username',name,'Password',mypassword);
websave(filename,url,options)
sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear @Rik, after I execute the codes, the html file of "cod09710.eph.Z" is downloaded (cod09710.eph.Z.html) instead of the original file.
Rik
Rik 2021-8-12
It is difficult to diagnose, as I don't have your login details (nor should you share them).
You could try two things:
  1. Use movefile to change the extension (this assumes this is actually the correct file, just the wrong extension).
  2. Set 'ContentType' to 'raw' in weboptions.
Let me know if either works.
sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear @Rik, I added the filename I needed to download to the url, then the html problem was solved.
Andre Ferreira
Andre Ferreira 2021-10-1
Dear @sermet OGUTCU,
I am also trying to download some products from the CDDIS with Matlab but I cannot succeed.
Can you please provide more details on how you have done it?
Best regards,
Andre
sermet OGUTCU
sermet OGUTCU 2021-10-4
Dear @Andre,
I use GAMP II open source software for downloading from the CDDIS. You can run GAMP II independently or using MATLAB.
Patrik Brigant
Patrik Brigant 2022-4-1
@Andre Ferreira Hi, are you using GAMP II aswell or did you solved the issue using Matlab? Thank you :)

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更多回答（1 个）

Yongjian Feng
Yongjian Feng 2021-8-12

1 个投票

Try this:
username = 'Your username here';
password = 'Your password here';
authStr = [username ':' password];
base64Str = ['Basic ' matlab.net.base64encode(authStr)];
headers = {'Authorization': base64Str};
options = weboptions('HeaderFields',headers);
webread('http://ip.jsontest.com', options)

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sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear Yongjian, I got the following warning and error after creating of headers:
headers = {'Authorization': base64Str}; == Warning: Colon operands must be real scalars.
options = weboptions('HeaderFields',headers); == Error using weboptions (line 352)
Expected HeaderFields to be of size Mx2, but it is of size 1x1.
Yongjian Feng
Yongjian Feng 2021-8-12
编辑：Yongjian Feng 2021-8-12
Try this instead:
username = 'Your username here';
password = 'Your password here';
options = weboptions('Username',username,'Password',password);
webread('http://ip.jsontest.com', options)
sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear Yongjian, the codes worked without error but it produces 1 x 79854 char variable. It did not download the file ("cod09710.eph.Z).
Yongjian Feng
Yongjian Feng 2021-8-12
Use websave to save it to a file
username = 'Your username here';
password = 'Your password here';
url = 'https://cddis.nasa.gov/archive/gnss/products/0971/';
localfilename = 'Local file to save to';
options = weboptions('Username',username,'Password',password);
websave(localfilename, url, options)
Yongjian Feng
Yongjian Feng 2021-8-12
It will be easier to debug this process using curl in a terminal outside matlab. But
  1. What has been saved into your local drive? code09710.eph.Z.html? Is it in HTML format? You can go to a terminal and cd to the folder then more code09710.eph.Z.html
  2. If it is a html, then the wrong file has been downloaded. If it is not a html file, change its extension to .Z and try to unzip it. If you can unzip it, most likely it is the one you want.
sermet OGUTCU
sermet OGUTCU 2021-8-12
Dear Yongjian, thank you for your further explanations.
weiyong yi
weiyong yi 2023-6-28
Doesn't work on my PC at all. Do you have any further ideas?
thank you.

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