Google Storage ArgumentException when setting CORS config

Question

Following Google docs, when using GoogleCloud Storage console:

mysef@myproject:~$ cat cors-json-file.json 
[ 
  {
    "origin": ["*"],
    "method": ["GET"],
    "maxAgeSeconds": 3600
  } 
]

then I get the following error:

myself@myproject:~$ gsutil cors set cors-json-file.json gs://mybucket
Setting CORS on gs://mybucket/...
ArgumentException: JSON CORS data could not be loaded from: [ 
  {
    "origin": ["*"],
    "method": ["GET"],
    "maxAgeSeconds": 3600
  } 
]

same error when I remove "method", "maxAgeSeconds" or add "responseHeader".

score 21 · Accepted Answer · answered Aug 04 '16 at 17:03

21

after so many tries, I ended up with modifing json file to:

$ cat cors-json-file.json 
[{
    "origin": ["*"],
    "method": ["GET"],
    "maxAgeSeconds": 3600
}]

and... it worked! Note that example from Google documentation is my first case (with [{ on 2 lines)

answered Aug 04 '16 at 17:03

comte

3,092
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1

Thanks this helped me... I had the exact same issue... still dont understand why this works though – Tyler Cowan Sep 21 '17 at 20:16
Note: I ran the gsutil command in the question after doing this – quasipolynomial Nov 30 '20 at 16:35
The line breaks as is formatted in this answer work. – Christian Bonato Apr 02 '21 at 02:46

score 5 · Answer 2 · answered Nov 13 '17 at 06:03

5

I had the same problem and it was caused by the type of quotes used. By opening the json-file in a plain text editor and change the quote to standard ones fixed the problem.

answered Nov 13 '17 at 06:03

lagren

51
1
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What do you call "standard ones" ? JSON quotes are double, by definition. – comte Mar 21 '20 at 14:23
2

@comte, by "standard" I mean the regular U+0022 (QUOTATION MARK). Some text editors or CMS might replace the standard quotation mark with U+201C and U+201D (LEFT DOUBLE QUOTATION MARK and RIGHT DOUBLE QUOTATION MARK). If the file content has been copied from somewhere, this might be hard to spot. – lagren Jun 30 '20 at 07:51
I see what you mean now. But that was not the case for me (and Tyler seems). It wasn't quotation marks the problem. – comte Jul 01 '20 at 08:07
Thanks. This solution works for me. Previously I tried to edit the JSON in the online editor, it probably corrupted from there. After I replace all the double quotes inside vscode, it works fine. – Ras Nov 29 '22 at 04:20

Super Kai - Kazuya Ito · Answer 3 · 2022-05-08T11:59:26.540

I got the same error when I tried to set the CORS settings with the trailing comma "," as shown below:

[
    {
      "origin": ["http://localhost:8000"],
      "method": ["GET"],
      "responseHeader": ["Content-Type"],
      "maxAgeSeconds": 3600, 
    }                   // ↑ Trailing comma
]

So, I removed the trailing comma "," as shown below then I could set the CORS settings successfully without no error:

[
    {
      "origin": ["http://localhost:8000"],
      "method": ["GET"],
      "responseHeader": ["Content-Type"],
      "maxAgeSeconds": 3600 
    }                   // ↑ No trailing comma
]

Google Storage ArgumentException when setting CORS config

3 Answers3