GenerateHTTPResponse

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`GenerateHTTPResponse`

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GenerateHTTPResponse[expr]

gives the HTTPResponse object that is generated when a cloud object containing expr is requested on the web.

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GenerateHTTPResponse[expr,req]

gives the response for the HTTP request specified by req.

Details

GenerateHTTPResponse effectively simulates the behavior of the Wolfram Engine cloud server.
GenerateHTTPResponse can be used both locally on a desktop system and in the cloud. Certain operations that require extended cloud infrastructure are not supported by GenerateHTTPResponse on local desktop systems.
The expression expr can contain any of the heads used in CloudDeploy, such as Delayed, FormFunction, etc.
In GenerateHTTPResponse[expr,req], the request req can be an association of the form returned by HTTPRequestData[] or an explicit URL in the form "url" or URL["url"].

Examples

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Basic Examples (4)Summary of the most common use cases

Apply GenerateHTTPResponse to Delayed to locally simulate a cloud server:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-685d35

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-jq51qj

Out[2]=2

GenerateHTTPResponse recurses on the expression until it returns an HTTPResponse:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-fyi2jt

Out[1]=1

You can use an explicit HTTPResponse to set the StatusCode or the headers of the response:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-50ke7b

Out[1]=1

Use ResponseForm to get a detailed report on the computation you've run:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-ra25z9

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-5gm3t1

Out[2]=2

Scope (3)Survey of the scope of standard use cases

You can use the second argument to set the details of the HTTP request:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-wpuz29

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-s2dvw7

Out[2]=2

If the data does not conform to the API specification, the status code is 400:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-wcogua

Out[1]=1

Use a URL object for the request URL:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-mcq171

Out[1]=1

Possible Issues (1)Common pitfalls and unexpected behavior

Some things are not supported in a local desktop system:

In[1]:=1

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https://wolfram.com/xid/0gcun01gfaxg4prw8e-6cy51p

Out[1]=1

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