WEB API error-404 - “Message”: “The requested resource does not support http method 'PUT'.”

Question

HTTP/1.1 405 Method Not Allowed
Cache-Control: no-cache
Pragma: no-cache
Allow: GET,POST
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcUHJvamVjdHNcZG90TmV0XFdlYkFQSVxBZFNlcnZpY2VcQWRTZXJ2aWNlXGFwaVxpbXByZXNzaW9uXDE1?=
X-Powered-By: ASP.NET
Date: Tue, 06 May 2014 14:10:35 GMT
Content-Length: 72

{"message":"The requested resource does not support http method 'PUT'."}

I want to generate PUT and DELETE request using POSTMAN but I got following message from POSTMAN.

Even I have implemented all the suggestions given by ASP.NET site.

Below is Web API c# code:

 // PUT: api/Students/5
    [HttpPut]
    [ResponseType(typeof(void))]
    public IHttpActionResult PutStudent(decimal Enrollment_no, Student student)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        if (Enrollment_no != student.Enrollment_no)
        {
            return BadRequest();
        }

        db.Entry(student).State = EntityState.Modified;

        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!StudentExists(Enrollment_no))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return StatusCode(HttpStatusCode.NoContent);
    }

Nothing has worked as I'm still getting a 405 response when trying to issue a "PUT" command against my Web API project.

Answer 1

您的后端api仅允许GET和POST请求（请参阅响应标头Allow），因此要生成PUT / DELETE请求API，应添加对它的支持。

Answer 2

You can configure this by modifying web.config of your ASP.NET Web API. Try to find the following line:
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

Replace it with:
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

Please refer here for more information.