CODEWITHSUNDEEP
pythonpostrequesthttp-post
CodeNoob
CodeNoob

Reputation: 1840

Python http post request format form data

Problem description
I want to send an http post request to an online BLAST website.I inspected the POST requests and saw this:

Request URL:https://p3.theseed.org/services/homology_service
Referrer Policy:no-referrer-when-downgrade

Request Headers
Provisional headers are shown
Accept:application/json
Content-Type:application/x-www-form-urlencoded
Origin:https://www.patricbrc.org
Referer:https://www.patricbrc.org/
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36
X-Requested-With:XMLHttpRequest

Form Data
{"method":"HomologyService.blast_fasta_to_database","params":[">test
ATAGCTAACAGCATC","blastn","ref.fna","10",50,0],"version":"1.1","id":"27057295081137034"}:

Now I want to do this for several sequences (so replacing the ATAGCTAACAGCATC ). I'm familiar with sending these type of request, however I don't now how to:

Code

 import requests as r

blast_url = 'https://p3.theseed.org/services/homology_service'
data = {"method":"HomologyService.blast_fasta_to_database","params":["%3Etest%0ATAGCTAACAGCATC","blastp","ref.faa","10",'50','0'],"version":"1.1"}
headers = {
            'Host': 'p3.theseed.org',
            'Accept': 'application/json',
            'Accept-Language': 'en-US,en;q=0.5',
            'Referer': 'https://www.patricbrc.org/app/BLAST',
            'Content-Type': 'application/rqlquery+x-www-form-urlencoded',
            'X-Requested-With' : 'XMLHttpRequest'
        }

res = r.post(blast_url, headers = headers, params = data).text
print(res)

I didn't fill in the id, but that doesn't seem to be a problem because in the error message the id is filled in (so it seems to generated it automatically?) This is the error I get:

{"id":"15004153692662703","error":{"name":"JSONRPCError","code":-32700,"message":"You did not supply any JSON to parse in the POST body."},"version":"1.1"}

So obviously the wrong formatting for the form data gives these problems, but I have no idea how I should format this (and if this will fix the problem)

Upvotes: 0

Views: 2122

Answers (2)

MohitC
MohitC

Reputation: 4821

You got malformed json string as error so remote api is expecting data to be of json format. You need to do

import json
data = json.dumps(data)
res = r.post(blast_url, headers = headers, data = data).text

And make content type of your header as:

headers['Content-Type'] = 'application/json'

Upvotes: 2

Dmitrii K
Dmitrii K

Reputation: 267

You should change this line res = r.post(blast_url, headers = headers, params = data).text to res = r.post(blast_url, headers = headers, data = data).text

Also, before using some tools, please read documentation of this tool, for example, dosc for requests you can find here

Upvotes: 0

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