error 400 bad request when creating issue

[Hany Hassan]

when creating issue with the following json sing Rest API , I got error 400 bad request

{"fields" : { "project":{"key":'Prj804255'},"assignee":{"name":"hassan"},"reporter":{"name":"hassan"},"issuetype":{"name":"Bug"},"description":"sdf","summary":"sdf","duedate":"10/10/2010 12:00:00 AM","customfield_10502":"GWA804255-2","customfield_10201":{"value":"Software Engineering"},"priority":{"name":"Major"},"customfield_13906":{"value":"SW - Engineering" ,"child":{"value":"Design"}},"timetracking":{ "originalEstimate":"1w 1d 1h"  }} }

[Nic Brough [Adaptavist]]

You'll need to show us the rest of what you're doing.  Your content looks fine, but a bad request is more likely to be caused by how you are posting, or that you're posting to an end point that does not exist.

[Hany Hassan]

@Nic Brough [Adaptavist] , I'm using post using this URL : 
http://jira.company.com/rest/api/2/issue/

and server URL is valid

[Nic Brough [Adaptavist]]

And the rest of the command?

[Simon Kinsler]

Is the issue with the single quotes here?

"key":'Prj804255'

[Hany Hassan]

I tried single and double , same problem