# HTTP post usage

**URL:** <https://discourse.julialang.org/t/http-post-usage/74014>\
**Category:** New to Julia\
**Tags:** http\
**Created:** [January 4, 2022, 2:41am UTC](https://discourse.julialang.org/t/http-post-usage/74014 "2022-01-04T02:41:06Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![sransome](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sransome/32/29810_2.png) [@sransome](https://discourse.julialang.org/u/sransome)\
**Post date:** [January 4, 2022, 2:41am UTC](https://discourse.julialang.org/t/http-post-usage/74014/1 "2022-01-04T02:41:06Z")

</div>

Hi,

I’m using http.jl for oauth2. I have no issues getting an authorization code but I get an error trying to exchange the code for a token.

```julia
resp=HTTP.post("https://identity.xero.com/connect/token",headers=Dict("Authorization" => "Basic MUY3NDk4sdfdsafdsafdsfgsadfZHR2JFQjIxOUNtQ0ZafdsfsdfsdhpdmF4ZGhSazdNcWxhX2hB"),
body=Dict("grant_type" => "authorization_code","code" => "fb26sadfsdaf7b25a065dasdfdsafdasfdsaf37b9d89165f7a86a1c8","redirect_uri" => "https://xero.com/"))

```

gives an error

```julia
ERROR: LoadError: MethodError: no method matching write(::HTTP.Streams.Stream{HTTP.Messages.Response, HTTP.ConnectionPool.Transaction{MbedTLS.SSLContext}}, ::Pair{String, String})
Closest candidates are:
  write(::IO, ::Any) at C:\Users\steve\AppData\Local\Programs\Julia-1.7.0\share\julia\base\io.jl:637
  write(::IO, ::Any, ::Any...) at C:\Users\steve\AppData\Local\Programs\Julia-1.7.0\share\julia\base\io.jl:638
  write(::IO, ::Union{Float16, Float32, Float64, Int128, Int16, Int32, Int64, UInt128, UInt16, UInt32, UInt64})

```

Can anyone give me a hint what I should look at to resolve this.

Thanks  
Steve

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<div class="post-metadata">

**Author:** ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Post date:** [January 4, 2022, 8:39am UTC](https://discourse.julialang.org/t/http-post-usage/74014/2 "2022-01-04T08:39:29Z")

</div>

Linking [related thread](https://discourse.julialang.org/t/possible-to-bypass-cert-verification-in-requests-jl-or-http-jl/5032/2).

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<div class="post-metadata">

**Author:** ![sransome](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sransome/32/29810_2.png) [@sransome](https://discourse.julialang.org/u/sransome)\
**Post date:** [January 4, 2022, 9:07am UTC](https://discourse.julialang.org/t/http-post-usage/74014/3 "2022-01-04T09:07:27Z")

</div>

Thanks Rafael.

I’m certainly not using a certificate, just a standard oauth2 flow.

I assume you are suggesting I create a client object using  
`client = HTTP.Client(tlsconfig=MbedTLS.SSLConfig(false))`  
and then pass this to the get like this  
`HTTP.get(client, url; options...)`

However I get ERROR: LoadError: UndefVarError: Client not defined  
and I can’t find it in the HTTP.jl documentation.

Thanks  
Steve

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<div class="post-metadata">

**Author:** ![paulmelis](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/paulmelis/32/35063_2.png) [@paulmelis](https://discourse.julialang.org/u/paulmelis)\
**Post date:** [January 4, 2022, 11:57am UTC](https://discourse.julialang.org/t/http-post-usage/74014/4 "2022-01-04T11:57:14Z")

</div>

> [@sransome](#):
>
> Can anyone give me a hint what I should look at to resolve this.

Are you sure that a Dict is a valid value for `body`? Looking at [the docs](https://juliaweb.github.io/HTTP.jl/stable/public_interface/#HTTP.request) it says:

> `body` can take a number of forms:
> 
> - a `String` , a `Vector{UInt8}` or any `T` accepted by `write(::IO, ::T)`
> - a collection of `String` or `AbstractVector{UInt8}` or `IO` streams or items of any type `T` accepted by `write(::IO, ::T...)`
> - a readable `IO` stream or any `IO` -like type `T` for which `eof(T)` and `readavailable(T)` are defined.

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<div class="post-metadata">

**Author:** ![sransome](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sransome/32/29810_2.png) [@sransome](https://discourse.julialang.org/u/sransome)\
**Post date:** [January 5, 2022, 2:32am UTC](https://discourse.julialang.org/t/http-post-usage/74014/5 "2022-01-05T02:32:14Z")

</div>

Thanks Paul,

if I’m to use a string for a body with multiple parameters what should that look like?

```julia
resp=HTTP.post("https://identity.xero.com/connect/token",
headers=Dict("Authorization" => "Basic UY3NDk4ODY5MTAwNEU5QjkzQjkxQTE1MzUxNDAzQTY6OUpEb2RjNVZHR2JFQjIxOUNtQ0ZVc1NRX2hSdEQyZVhpdmF4ZGhSazdNcWxhX2hB"),
body="grant_type = 'authorization_code',
code = 'fb263ea987b2d82b9ae644d351b74361e429165f7a86a1c8',
redirect_uri = 'https://xero.com/'")

```

What defines the structure of this string? Is this specific to HTTP.jl or the HTTP standards?

I’m feeling so inadequate in this area of Julia. Should I perhaps consider just using python code in julia for this stuff because it’s usage documentation/tutorials etc are so much better or would this just introduce another raft of problems?

Thanks  
Steve

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<div class="post-metadata">

**Author:** ![paulmelis](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/paulmelis/32/35063_2.png) [@paulmelis](https://discourse.julialang.org/u/paulmelis)\
**Post date:** [January 5, 2022, 8:49am UTC](https://discourse.julialang.org/t/http-post-usage/74014/6 "2022-01-05T08:49:53Z")

</div>

> [@sransome](#):
>
> if I’m to use a string for a body with multiple parameters what should that look like?

Looking at the analogous API in Python’s `requests` module (which does take a dict), those values are encoded as content-type `application/x-www-form-urlencoded`:

```julia
import requests
r=requests.post('http://localhost:8080/', data={'a':1, 'b': "doh"})

melis@juggle 09:37:~$ nc -l -p 8080
POST / HTTP/1.1
Host: localhost:8080
User-Agent: python-requests/2.26.0
Accept-Encoding: gzip, deflate, br
Accept: */*
Connection: keep-alive
Content-Length: 9
Content-Type: application/x-www-form-urlencoded

a=1&b=doh

```

So if you can do the same with HTTP.jl that should work. [Here’s](https://discourse.julialang.org/t/form-encoded-data/31869) actually a post on this forum from some years ago, with exactly the same issue, but no answer :-(. There’s actually also a closed HTTP.jl [issue](https://github.com/JuliaWeb/HTTP.jl/issues/281) to document exactly the thing you want here, but the docs were only updated for the case of POSTing JSON, although the issue does give a solution (see [this comment](https://github.com/JuliaWeb/HTTP.jl/issues/281#issuecomment-414177317)):

```julia
headers = ["Content-Type" => "application/x-www-form-urlencoded"]
params = Dict("Password" => "password")
body = HTTP.URIs.escapeuri(params)
response = HTTP.post("http://localhost:8080", headers, body, verbose=2)
HTTP.Messages.Request:
"""
POST / HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: localhost:8080
Accept: */*
User-Agent: HTTP.jl/1.7.1
Content-Length: 17

Password=password"""

```

Edit: deleted reference to example that does not apply here

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<div class="post-metadata">

**Author:** ![dliden](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dliden/32/34270_2.png) [@dliden](https://discourse.julialang.org/u/dliden)\
**Post date:** [March 3, 2022, 1:57am UTC](https://discourse.julialang.org/t/http-post-usage/74014/7 "2022-03-03T01:57:39Z")

</div>

I ran into a similar issue (same error message) today and largely solved the issue by wrapping the Dict-formatted body in a `JSON.json()` call.

```julia
url = "https://api.bit.io/api/v1beta/import/json/"
payload = Dict("create_table_if_not_exists" => true,
    "table_name" => "jl_test",
    "repo_name" => "DL Tests",
    "data" => arraytable(invoices))
headers = Dict(
    "Accept" => "application/json",
    "Content-Type"=> "application/json",
    "Authorization"=> "Bearer $pw"
)
HTTP.post(url, headers, json(payload))

```