Allow body implicit assert before [Asserts] section or just change error message

[lepapareil]

Problem to solve

I want this Hurl file whith implicit body assert before [Asserts] section to succeed:

GET https://hurl.dev/assets/img/logo-light.svg
HTTP 200
```
<svg width="704px" height="183px" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g style="">  <path d="M498.000000,33.000000 L652.046555,33.000000 C652.051235,14.993509,652.042435,0.117931,652.000665,0.000622 L703.499993,48.000000 L651.999993,96.000000 C651.999993,96.000000,652.015443,82.165430,652.028753,65.000000 L497.999990,65.000000 Z M652.000000,0.000000 C652.000220,-0.000210,652.000440,0.000000,652.000670,0.000620 Z " fill="#ff0288" stroke="none" />
</g><g style="">  <path d="M695.000000,115.000000 L540.953445,115.000000 C540.948765,96.993509,540.957565,82.117931,540.999335,82.000622 L489.500007,130.000000 L541.000007,178.000000 C541.000007,178.000000,540.984557,164.165430,540.971247,147.000000 L695.000010,147.000000 Z M541.000000,82.000000 C540.999780,81.999790,540.999560,82.000000,540.999330,82.000620 Z " fill="#ff0288" stroke="none" />
</g><g style="">  <path d="M0.250000,0.500000 L0.250000,179.000000 L39.500000,179.000000 L39.500000,102.000000 L111.750000,102.000000 L111.750000,179.000000 L151.000000,179.000000 L151.000000,0.500000 L111.750000,0.500000 L111.750000,69.000000 L39.500000,69.000000 L39.500000,0.500000 Z M303.000000,179.000000 L303.000000,49.750000 L267.500000,49.750000 L267.500000,117.500000 C267.500000,130.666733,265.333355,140.124971,261.000000,145.875000 C256.666645,151.625029,249.666715,154.500000,240.000000,154.500000 C231.499957,154.500000,225.583350,151.875026,222.250000,146.625000 C218.916650,141.374974,217.250000,133.416720,217.250000,122.750000 L217.250000,49.750000 L181.750000,49.750000 L181.750000,129.250000 C181.750000,137.250040,182.458326,144.541634,183.875000,151.125000 C185.291674,157.708366,187.749982,163.291644,191.250000,167.875000 C194.750018,172.458356,199.541636,175.999988,205.625000,178.500000 C211.708364,181.000013,219.499953,182.250000,229.000000,182.250000 C236.500037,182.250000,243.833298,180.583350,251.000000,177.250000 C258.166702,173.916650,263.999977,168.500038,268.500000,161.000000 L269.250000,161.000000 L269.250000,179.000000 Z M330.000000,49.750000 L330.000000,179.000000 L365.500000,179.000000 L365.500000,120.750000 C365.500000,114.916637,366.083327,109.500025,367.250000,104.500000 C368.416673,99.499975,370.374986,95.125019,373.125000,91.375000 C375.875014,87.624981,379.499977,84.666677,384.000000,82.500000 C388.500023,80.333323,393.999968,79.250000,400.500000,79.250000 C402.666677,79.250000,404.916655,79.374999,407.250000,79.625000 C409.583345,79.875001,411.583325,80.166665,413.250000,80.500000 L413.250000,47.500000 C410.416652,46.666662,407.833345,46.250000,405.500000,46.250000 C400.999977,46.250000,396.666687,46.916660,392.500000,48.250000 C388.333313,49.583340,384.416685,51.458321,380.750000,53.875000 C377.083315,56.291679,373.833348,59.208316,371.000000,62.625000 C368.166652,66.041684,365.916675,69.749980,364.250000,73.750000 L363.750000,73.750000 L363.750000,49.750000 Z M428.250000,0.500000 L428.250000,179.000000 L463.750000,179.000000 L463.750000,0.500000 Z " style="fill: rgba(38, 38, 38, 1.000000); stroke-width: 0.000000px; stroke: rgba(0, 0, 0, 1.000000); " fill="#333333" stroke="#000000" stroke-width="0.000000" />
</g></svg>```

[Asserts]
header "accept-ranges" == "bytes" 

If we don't want to permit implicit body assert before [Asserts] section, then we have to improve the actual error message :

error: Parsing method
  --> -:9:1
   |
 9 | [Asserts]
   | ^ the HTTP method <> is not valid. Valid values are GET, HEAD, POST, PUT, DELETE, CONNECT, OPTIONS, TRACE, PATCH
   |

[jcamiel]

According to the doc, the implicit body assert must be after the explicit asserts section https://hurl.dev/docs/response.html#structure We could try to improve the error though, because it must be a common error!